How can you be sure someone is not storing CSAM on your server, if it’s encrypted?

It sounds like storj from a decade ago, but you got at least some monopoly money for your storage there. I don’t follow what they are doing nowadays but it started similarly

You can try the hosted version here: https://app.nocodb.com/

Have you checked nocode platforms/databases? It’s basically a cross section of a super powerful excel and a database manager. You can set up the way you want, link records from different tables, add images, files to “rows”, like excel on steroids. You don’t have to understand SQL at all, that’s why it’s called “no code”.

I use nocodb. Tried baserow before, but I didn’t like that a lot of basic features are not available in the foss version, in nocodb only some bells and whistles are behind a paywall and not available in the self hosted version

They are also called airtable clones, as airtable was the first well known platform like these.

Some other similars exist: https://alternativeto.net/software/airtable/?platform=self-hosted&feature=database-management