Making old games free that used to be paid titles is something that the popularity of Steam, GOG, etc. has mostly killed off. There is the occasional entirely-free game released, though -- I mention some in my list. Most of those freeware Windows games I mention are from the '00s.
Was EGA Trek originally shareware? It's certainly free now, and I've never seen it with a 'please register' screen or something, but maybe? Do you know for sure?
Huh, I don't know if I've ever played that version, just Mario!!, which was freely distributed. It does look pretty much the same as that game though, so that sounds plausible.Super Angelo was also shareware; I think the Mario!! you are referring to was a leaked, incomplete version.
Mario!! looks nice, but the keyboard-only controls and PC Speaker-only sound hold it back... I mostly listed it because it was amusing to have a Mario Allstars-graphics game on the PC back in the '90s.![]()