Also, it’s a classic case of “if something is free, then you are the product”
While I agree that it's sensical not to offer this, I think this statement is too broad. Protonmail didn't require any verification for quite some time, and tutamail used to allow using the free plan to sign up for services.
I don't think that's a good idea when located in a country of high censorship and stuff.
But thanks, I'll have to think about it more, maybe that could work. Don't even know if android really supports that, but yeah.