Well, for me it was a bit to focused on visual programming, as I actually do know quite some programming languages and feel more comfortable with a full language.

But it has great tutorials, everything you create is yours, the full engine is Foss and it is very capable. I think it is the ideal engine for beginners, I remember thinking that I wished it was around when I was just starting out :).

The only paid stuff is if you want to use their online services (for hosting your game or leaderboards) and some assets are also for sale I guess (but this is the same in almost any other engine, e.g. unity asset store or Unreal). So no paywall in my opinion, again, the full engine is MIT licensed.

GDevelop fits your question 100% in my opinion.