Yes, I heard about Proton Wallet more than a month ago. Proton Email is a well-known and well-established service in the field of maintaining privacy, and it has a large user base.
In addition to the wallet being self-guarded, what I also do not like is the link between the email and the wallet. This point may be a privacy loophole. Some people like to use email to send cryptocurrencies, but for me, I do not like it.
In any case, Proton is a large company and I think its entry into this field will have positive results in the long run.