I don't really trust "free" cloud services. Hosting has a cost, if they aren't charging to get that money, how else are they going about getting it?
Hi, I am the lead developer of bitwarden. bitwarden is currently sponsored by the Microsoft BizSpark program which covers many of our operation costs and allows us to offer services for free to our users. We are working to introduce enterprise features for businesses in the future which will allow us to monetize. For now though, everything is free for users.