You seem to be conflating anonymity with privacy.
I don't know your bank account either. Do you think it's very private?
Don't be stupid.
Discussion
Is it public? Don't be stupid.
Once you pay me with it, I'll know.
Perhaps you're satisfied with leaving an eternal trail of plaintext information about all your transactions.
If you can't see why that is not optimal, I don't have anything else to say to you.
And I wouldn't care at all, except your stupidity normalizes things that screw everyone else too, like always-on surveillance.
But you can't see that either, or you would think differently about it, and so there is no point in wasting more time trying to make you see the obvious.