I love Bitwaden, the app does its job, and obviously I trust it. And I'm ubergrateful for the free service.

Nothing about the free version is crippled, ad-supported, or privacy invading, so for a personal account a paid upgrade is, and feels, completely optional. (That's one of the many huge reasons to use open-source, community-based software in the first place.)

One thing: if there is physical address information somewhere on their website, it is extremely well-hidden.

As a librarian I helped law students for 30 years, from the 80's, to the birth of the web in the the 90's, on. I always told them to examine websites carefully to determine credibility before using them as a research source. One of the things I tell them to look for is a physical address for the website owners. Especially if there is no public phone number, you should put a physical address in addition to other contact points. No one would ever write, of course, but you would be more likely to get customers like the kids I've been privileged to influence over the years.