I am very new to linux and all the open source stuff (my first post on lemmy actually) so I don't get how this stuff works but flathub is saying that floorp is proprietary. But after a quick google search it says that floorp is open source licensed under MPL 2.0
A lot of outdated information. Looks like they've been open and closed source at different times. Most recent info I could find (from last month) states: "While Floorp wasn’t originally closed source, we plan to revert to an open-source license under the GNU definition."