It is great news. It feels like they didn't do it because of the change.org though, the uservoice has been requesting it for years.
They already had a controversy some time (years?) ago, saying stuff like "Bitcoin is all we need", "everything other than Bitcoin is a shitcoin", "we don't want to associate with the criminal record Monero carries"... something like that.
What you can do is to use non-kyc exchanges, send XMR in, exchange to Bitcoin, and withdraw directly to Proton. Proton won't be all hurr durr about dirty Bitcoin.
This has been asked at User Voice
Now accepted! https://monero.town/post/6325819