Yes, it has. But game engine adoption takes time, it's not immediately clear that it is eating some of Unity's lunch, as games have to be developed, launched and appreciated before it's obvious for the average (developer) person.
Look at some of the games that made Unity popular in the first place, and the people/companies that made them. Lots of them are moving to Godot now, but again, it'll take time before those people/companies launch the games.
Do you mean renpy? You might not have heard of it, but it's more or less the de facto engine for new visual novel games. Hence having so many games as well, the barrier to entry with using Python+mostly static images is basically non-existent.
