Making a browser is expensive (especially with such incompetent management), they need to make money somehow.
Firefox
/c/firefox
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They're already getting money.
If you don't disable it, they always have.
My Android phone isn't my primary and does not have an active SIM in it (it's WiFi only), but my Firefox has no ads, and blocks all the ads (that I've encountered at least). iOS... is iOS. I mainly use Safari there, but, that's a whole other story. Suffice it to say, I don't have this problem on either handset.
It's not that bad, IMO.
That being said, you sould 100% be using Cromite if you're on android. Not only is its adblocking/antifingerprinting basically state-of-the-art, but its (unfortunately) way faster than firefox.
Killing sideloading might kill it though...