Ok.
There are two sure fire ways to prevent this.
But first, there is something strange about these notifications not being able to be turned off.
If you are on a page similar to my screenshot above, and you turn the notifications off from there, that should do it.
Anyway, let's move on to what will work no matter what.
The most simple thing to do is to just disable the apps and not use them.
Your browser can get you right onto the websites that these apps take you to.
However, they are not optimized for mobile devices, and you will have to learn to live without some niceties that you have probably grown accustomed to.
It is simple enough to test out, just open your browser and enter youtube.com.
The same goes for googleplay.com , but I will say that I really, really don't like the Google Play Store website.
But that is fine, because there are other appstores available.
UpToDown is the number two appstore on Earth, and is pretty cool.
There are most of what Google Play has to offer, and some that Google does not have.
The app is nice, but the website works rather well, too.
https://en.uptodown.com/
Another great appstore that has both a real nice app and an excellent website is ApkPure.
https://m.apkpure.com/
Another one that you can check out is F-Droid. These apps are generally utilitarian, but are also FOSS and have no Google spyware, ads, tracking, or any of that junk.
The F-Droid site is odd, and the app is not as simple as the others.
But it is worth it, trust me.
https://f-droid.org/
Now for Youtube.
Aren't you sick of the ads, and the horrible recommendations?
And you have to pay to have it play in the background.
Try NewPipe, which gives you no ads, the abilities to download and have it play in the background.
NewPipe (Lightweight YouTube frontend) -
https://f-droid.org/app/org.schabi.newpipe
Now, you will still want the website saved as a bookmark in your browser, so that you can sign in/out and comment.
And now here is the great escape.
But it will take a bit on your end to make it work.
NoRoot Firewall is a great way to start using a firewall to limit the internet connections of apps on your device.
If you already have experience with firewalls, probably the best one out there for Android is NetGuard.
But, it is more involved. It is larger and uses more resources than NoRoot does.
This is important on low end devices, because if yougo this route the firewall must run constantly, 24/7, 365 days a year.
I like simple things, and have low end devices.
So, here is a link for NoRoot. Even if you don't think this is what you want, it is very small, pretty simple, and there is always time to learn something new, right?
https://noroot-firewall.en.uptodown.com/android
This type of firewall uses the VPN api of your device to block internet access of apps that you choose to do so.
So that neans that it will not work if you use a VPN, because Android only allows one app to use the VPN service at a time.
Open the app, and tap Start.
Be sure to tick the box that allows the app to Start On Boot.
Tap Apps, at the bottom, and you will see an alphabetical list of all your apps, and the means to allow/disallow internet access for each app on Wi-Fi and on cellular.
If you have any doubts about what to allow or not, you can allow everything except for Google and Youtube (and any other apps you are having this issue with).
You can also look up any of the listed apps via your browser, to see if internet access is even needed for them at all. By default, apps that don't have access won't appear in the app.
When you do want to use the Youtube or Play Store apps, open NoRoot and tick the box(es) that will allow internet access, and now they will work normally.
When you are done, remember to uncheck these boxes to prevent access.
Go to your device's Settings, and then find Network & Internet, and then select VPN.
Next to NoRoot Firewall, tap the settings pinwheel and then tick the switches for Always On VPN and also for Block Connections Without VPN.
Always On will do its best to keep the app running all the time.
Block Connections will ensure that no apps can access the internet unless the app is running.
Now, go back to your first settings page, and find Battery.
Find the Battery Optimization and then select All Apps.
Find NoRoot Firewall, and tap it, then select Do Not Optimize.
This is all to try to make sure that the system does not turn the app off.
It seems like a lot, but it reallyvis worth it in the end.
And just so you know, I use all of the above.
The only issue is on the rare occasion that the app crashes, almost always due to the low end capabilities of my devices.
It is rare, and it only takes me a second to remember that the app exists and I have to open it and tap Start.