I don't see the point to this. All their other products seem to be targeted at replacing less private, non-E2EE services. Mail, calendar, VPN, and a password manager are excellent choices with no major well integrated E2EE solution. This, not so much.
Also, I don't really get why they chose Bitcoin, it's PoW and is much less energy efficient than other alternatives while also not being as private as Monero, nor having things like smart contracts.
If you want the answers to the questions you listed, then it's pretty much covered in the privacy podcast called OptOut. Linked here if u wanted to have a listen.
Signed up for decent encrypted email and now I feel like Proton's only goal is to shove so much extra shit down my throat that they'll choke me to death- and apparently I'm the only subscriber completely uninterested in any of it.
I genuinely don't get why they made a Bitcoin wallet, but all of their other services are direct competitors to (and imo much better than) the Google suite apps and made it much easier to de-google my life
Proton VPN, Proton Drive, Proton Pass, etc- none of these existed when I signed up but here they are. If anything I'd rather opt out of all the extra stuff for a discounted rate, but that'll never happen.
I received my invite today as well (Portugal). Overall here are my first impressions:
Interface is very clean, but lacks a Dark mode
You can import wallets by seed phrase only
Buying bitcoins redirects you to a broker's website, it's not as seemless as I'd like. They ask you for all sorts of personal information, which I guess is industry standard, but it's a third party service
I tried making a 50 euro purchase, but after a few hours I got an email saying it was canceled, no reason provided
You can't sign messages to confirm the ownership of your wallet, which is required by some brokers
This service is marketed as exclusive to users in the Visionary plan. I'm in the Proton Unlimited plan. It's unclear what's going to happen to my wallet once this beta period is over. Am I going to lose access to my bitcoins? Some functionality? The Proton support just told me "Please be advised that Proton Wallet is only available for users on our Visionary plan at the moment", which doesn't fully clarify it.
I just set it up as well. Nothing groundbreaking, but clean interface. Haven’t used the btc via email function yet.
My only concern would be if there was some sort of breach that affected my proton credentials (yes, I realize the odds are low), then that would also give access to my wallet (and passwords, but not using that).
This might be good for a hot spending wallet, but not sticking anything substantial in there.
I’m in the EU. So far, it’s been really easy to follow everything. I made a €20 purchase (you get redirected to a third party, with two available to choose from) without any issues.