Proton VPN, Proton Email, Proton Wallet, etc... I don't like the idea of creating multiple privacy-oriented apps and centralizing them under the same company/management. That's what Mullvad does recently too and I don't like it.
I agree, ideally we shouldn't rely too much on single company. But at least it's better than seeing people use Google apps/services.
By the way, I was expecting this to be an open-source wallet like Electrum but it's required to register on Proton before you use it. I only wish that developers of Electrum and Sparrow copied some UI elements from Proton's wallet, both, mobile and desktop version.
Looking at
https://github.com/protonwallet/, it's open source. But AFAIK nobody audit it.