I've said this before and I'll say this a million times again, capitalism is simply not viable. The main mechanism to punish bad business practice (using a different business) also hurts the significantly weaker consumer; meaning it will almost never be used properly.
I point this out here because I agree with your stance and cannot stand the "vote with your wallet" nonsense people pretends works.
This makes it really difficult to navigate the privacy space because eventually a cornerstone like Proton is "corrupted" and we have no way to correct it. We seriously need people thinking about solutions to this problem, or we'll be going nowhere fast.
At face value this is true, but I challenge you to consider the knock-on effects of having a decentralized platform. One of which being that it become increasingly difficult to coerce someone into giving PII (i.e phone number) to signup - they'll just go elsewhere
This effectively makes it more private for everyone.