>I do believe this is a growing market, giving people who are fed up with BigTech
Most people I interact with don't even think about "Big Tech" in this way. They don't question iCloud storage, Google Drive or Google Workspace, Microsoft OneDrive etc.
They do sometimes get upset about right to repair, AI, and sometimes I hear about net neutrality or how Google search sucks, or how Facebook is privacy invasive.
To reiterate though, the core services like a product like this would replace - Google Drive, iCloud Drive, OneDrive etc. - that is not on the radar. Let alone having functional seamless replacements for email or calendar or contacts etc.
These are people adept at using technology too, there simply is no reason to invest in these types of products to them.
The reason these companies struggle is because mass market doesn't care about this enough first and foremost. They aren't seamless drop in replacements.
They don't handle my phone backups, for example, wirelessly and seamlessly. They don't offer seamless contact sharing, photo sharing and sometimes even file sharing is so clunky compared to a Google Drive link, or an iCloud download link.
How do they handle expiry on a link address for said share?
At best, what you have here is an on premise redundant storage drive and little else. It doesn't have the seamless features to do what the other services do. Even if its on the spec sheet, the experience isn't seamless enough. This is the same problem Nextcloud has been trying to solve for some time.
I think among technologists, the market for this is growing, but thats been the case for some time, its simply reaching more and more of us. This being a knock out commercial success where every 3rd person you know is buying something like this? That isn't happening in the foreseeable future.