I don't really know how stable Fedora Rawhide is, because I only used it once. But OpenSuse does a whole lot of testing before shipping any update. From their website:
Why should you consider openSUSE Tumbleweed over other distributions? The answer lies in its rigorous testing and stability emphasis. OpenSUSE is the base for SUSE Linux Enterprise Server, meaning it’s secure, stable, and provides most of the software and tools you may need. While some rolling release distributions may offer the latest software packages, openSUSE Tumbleweed couples this with a strong emphasis on ensuring these updates won’t destabilize your system. Every Tumbleweed snapshot undergoes rigorous automated testing via openQA, openSUSE’s comprehensive testing tool, before its release. This process prevents critical bugs from reaching your system, providing an unexpected level of stability for a rolling release.
Also, I don't think they make that much money from individuals. They focus more on businesses, because they pay more and these customers stay around for a long time, they can't easily switch to a different solution.
You can selfhost Bitwarden/Vaultwarden (which I recommend, since it's rewritten in Rust and you get all the premium features for free) and use Bitwarden Send. This is probably more secure than most other options.
Well better then nothing