Is Protonmail feasible for online shopping?

Hi Reddit, I’m getting a grip on becoming private, or at least as much as I can. I’m currently using Guerrilla Mail for any throwaway/one-off accounts, and considering switching from Gmail to Protonmail: however, I have a few questions. First, it’s in the title: while I’m not buying anything illegal (just anime figures and assorted geek shit), obviously my billing address and bank receipts are very sensible data, can I trust Proton with that? And since I have already used my Gmail for some purchases, well, let’s say Google already knows. Am I very fucked up? How could I do some further damage control on this? I know you’ll probably get tired of these kind of questions from peasants like me, but I just want to say, thanks in advance! Without you I would not even know where to start.

Found here