There are stupid ways to use Proton, just as there are stupid ways to buy and use Bitcoin. 
But there are many smart ways to do this. Then there's Lightning, then there's Cashu. 
Less private than credit cards LOL.

> Both name and surname are connected to your centralized exchange.

But that information is not directly visible by merchant. Needs chananalysis, which gives some uncertainty, unless you paid directly from the CEX.

But CEX is not a requirement to use Bitcoin, I have seen totally computer illiterate people, not geeks, buying Bitcoin with cash peer to peer.

kristapsk

Both name and surname are connected to your centralized exchange.

If you want to insist that potential layer of indirection makes any tangible difference, then you are arguing semantics, not realities.

Besides, your merchant most likely captured your name and surname during the payment process too.

In either case, stating that paying with Bitcoin let's you stay private is just blatantly false.

privacy

Protonmail is now fully compromized

anon

Both name and surname are connected to your centralized exchange. 

If you want to insist that potential layer of indirection makes any tangible difference, then you are arguing semantics, not realities. 
Besides, your merchant most likely captured your name and surname during the payment process too.

In either case, stating that paying with Bitcoin let's you stay private is just blatantly false.