Every so often someone is like, Dropbox isn’t that hard. Look at this amazing ZFS/whatever! So simple. Yeah, I keep paying Dropbox every year so I don’t have to think about it. I shoot a sync off to backblaze every once in a while.
I love Dropbox, I pay annually. I use the open source client https://maestral.app/ on the Mac for workstation use, but also integrate other systems with my Dropbox account using their API. If someone built an open source Dropbox server that sat on top of S3 compatible storage, I would not only use it, but pay to have that optionality to get out of Dropbox if they ever enshittify. I can recognize form and function worth paying for ("value"), but still want an exit plan. It's not about the spend, it is about data sovereignty. This is colloquially referred to as “vendor and third party risk management.”
I dislike Dropbox for reasons that aren't technical, but the big thing for me is that I want either E2EE, or control/ownership of where my data is stored. These are my personal files (no, not that kind of personal), I'm not just going to scatter them on the internet.
My solution so far has been NextCloud, but I'm getting pretty fed up with it. But not enough to actually do anything about it... yet.