The UI looks the same lol

The layers are the big thing, but its hard to show because the final result looks the same anyways

It’s hard to say. “Open core” means that most of the software is open source (licenses vary) but some features are locked behind a paywall. Gitlab takes this approach for example, also maybe onlyoffice.

There are some pretty corporate “open core” software companies tho, that’s a more grey area