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There is also a phrase in Blue Mail privacy policy, regarding the analytics they use, which says ..."The web tools collect information sent by your browser, including the pages you visit and other information that assists us in improving Blue Mail." When I read this, I see it as a privacy violation phrased in terms of some kind of future benefit to the user.While the question about business model is legitimate in this case, I would argue with the last statement in your post: Some people do it "for the fun of it".
Just one example: https://play.google.com/store/apps/developer?id=SECUSO+Research+Group
As for Blue Mail, there is a phrase in the privacy policy that concerns me as well (and has not been mentioned yet):
"Some of the information Blue Mail uses to communicate with your device – like its IP address – can be used to approximate the device’s location. This information may be used to administer, analyze and improve Blue Mail."In view of the other information about what they do, my question is: how exactly are they collecting IP address(es) of my device and how are they using location information? Are they analyzing that for each message, or do they continuously poll my IP?
Or, maybe it is about the access to their website via browser?
EasilyDo came out a year or two after MailDroid was released and did not do well. I know they rebranded, but don't know much about their revenue process at this point. Again, a company with developers will need to pay those developers somehow. K9 is open source and free and MailDroid has ads and a pay version...these are the only 2 that don't have servers, don't have a huge development team that needs to be paid a lot and have been around a while with loyal users (and no major advertising).
I trust MailDroid and K9, but neither has the UI polish of AquaMail.
Have you tried an additional blocker?
Sadly, without root I'm afraid my experience matches yours. I've tried Blockada, Block This, DNS66 and AdGuard, and found them all very similar: each blocks some stuff but lets a fair amount through. None comes close to the IPtables-based root adblockers.
Interesting, I've been using Blokada on my no-longer-rooted S5 (since I updated to 6.0) and I find it to be just as effective as AdAway.
RIP Crash.