It was removed exactly because of reviews like yours. You are writing a bad review because of an EXPERIMENTAL feature is not working perfectly. (which was NEVER advertised anywhere, it is not anywhere on the page)
This doesn't help, we will not going to add any fun free features if people just going to hate on it. This is the third negative review just because we decided a few months ago to experiment and release some extra free features. Tell me how would that motivate anyone to add and maintain free things?
And 2 databases are supported, (h2 and sqlite) you are just lying about that they aren't. It takes 5 seconds to verify that they exist as the plugin wouldn't work without a database. (duh)
Another lie is that we didn't say that it is experimental, which is not true, it was described in multiple places:
https://prnt.sc/MTdX5Eu_zFAU (update log)
https://github.com/Artillex-Studios/AxVaults/blob/dc779a4894cd16a8de601c852444187eeec55974/src/main/resources/config.yml#L41 (config of last version that has this)