A CDN, or Content Delivery Network, (such as Cloudflare) is a man-in-the-middle service deployed by webmasters to stop potential attackers, DDoS attacks, spam and the like. Sadly, Cloudflare has become more like an Anti-Privacy service that always makes browsing with Tor a pain in the neck. The 'endless Captcha' game along with it outright blocking you from specific websites, especially those relying on Cloudflare, are the worst. Cloudflare actively blocks Tor exit nodes. Cloudflare is also infamous for supporting white supremacists (well, it's rumored) so I want no part of them anyway, but sadly 90% of the internet uses them, including Xenforo, which runs this forum. Can't even DuckDuckGo without a Cloudflare ban. Forget Apkmirror.com too.
I wish I could find a proper YouTube alternative, since I follow a ton of folks there with interesting content (such as Shango066 and radiotvphononut--two vintage tech content creators with great commentary) and while some might bleed over to more than one service, such as Odysee or Bitchute, it's impossible to know if I can find all my favorite content creators on alternative platforms. I don't think it's possible to leave YouTube without giving far too much up right now.