I’ve been using it for months now on RHEL, Fedora and some Ubuntu derivatives using NextCloud as the primary location of the vault, All have been using the NextCloud client to sync the bits and never had an issue at all. I’m doing the same on my wife’s Windows 10 laptop but she rarely uses it so that’s not much of a test. I access same vault from Android and iOS. All working well.
macOS, iOS, and Android here, zero problems in 3+ years with daily usage. I would suggest you save your files to both for a while and use Cryptomator as your primary.
webdav is a backup option and if you are on a Mac I would suggest using FUSE instead of FUSE-T (the latter is in the experimental stages). There’s also some Mac oddities to note, you can’t colour tag a file or set a default ‘open with’ for instance. Data integrity though has been flawless for me, others have had problems so check out the bug list here and see if it makes you comfortable.
If you’re regularly dealing with files over 4Gb just stay where you are perhaps? Your post is kind of combative so maybe it’s not the product for you.
when cryptomator is a startup, i paid USD12 as a beta user, and after 4 years, if there is no stable program to use, i will doubt how the money-flow works.
what further sucks, is that due to the naive of ctmt, i chose to use boxcrypt, and it was bought by dropbox and kicked every free users away.
further complicated by gocryptfs/cppcryptfs that by default they could not run on mobiles like android.