It wouldn’t be trivial to package such a big app as a flatpak (or snap for that matter) and also maintain it properly, so as long as the original developers don’t do the work I think it is unlikely to happen. But for a tool that I’m going to be using a lot in the future I think it makes sense to invest the time once to install it, even if it’s a bit more complicated.
As for DaVinci Resolve, installation can be a bit weird if you don’t happen to run one of the officially supported Distros. Because of that, the easiest way to run it is probably via DistroBox, Michael Horn made a great tutorial about that: youtu.be/wmRiZQ9IZfc
I had been using Linux on servers for years, and finally also decided to give it a shot on the Desktop during the Linux challenge from linustechtips. Went to PopOS first, then Fedora and Debian and am currently on OpenSuse.
I think this is a pretty good idea, actually. While this kind of information is available in most western places, people usually can’t be bothered to look it up and then have very weird ideas about what their taxes are probably spent on. This would at least help clear some things up.