If they haven't used it before, why would proton having it change their mind?
Most proton users seem to hate the new bitcoin wallet (see reddit).
Sad to see that bitcoin has such a bad reputation trough all the shitcoins stuff happening.
https://old.reddit.com/r/ProtonMail/comments/1eayqs4/proton_wallet_early_access/
Discussion
I don't expect proton to change their minds but wouldn't have expected so much hate/negative comments on such a clean product.
Not being pro-bitcoin/using it doesn't automatically mean one has to be a hater.