When weighing up all the benefits related to the company behind it, the fact remains it is still a web wallet and that will entail a degree of concern even for the most open minded crypto enthusiasts.
Keeping that aside, though not directly relevant to their Bitcoin wallet it is important to mention in the past Proton had to face massive negative publicity for claims they made on their website (
we do not keep any IP logs) but only to remove the words from their Privacy Policy after the backlash.
It may have happened in 2021 but apparently it seems
Proton handed over email related information including IP addresses to French authorities that requested them via a Swiss court. When that request arrived, the Swiss judge forced Proton to log and disclose the IP and browser fingerprint of a specific person. That basically is shocking even though they provided mitigation by saying they had no choice as it was a legal request they had to comply with. All that because the French authorities were seeking information on a
climate activist.
Back to their web wallet, I would advise against using it for the same reasons you have cited.
There is no single reason that will push me and many other people to use Proton Wallet instead of Electrum and Sparrow.
Me neither, to be honest. I am using a combination of hardware wallets, desktop, and mobile wallets, and see no reason to bring a web wallet into the mix. Regardless of the company behind it and its non-custodial nature, it remains a web wallet that relies heavily on storing sensitive data on centralized servers. A leak, hack, or an unhappy employee could cause a lot of problems.