I just bought the F.E.A.R bundle from steam a week ago or so, and beat the first game in the series 20 years after release. And other than a fan made .dll patch, it was great. Lacked some depth more modern titles have, but I also noticed how much effort was put into some details that were surprising for its age.

Witcher 3 was also self published, and it came down to 70% off after a few years.

It is not illegal to make backup copies for yourself of games you have purchased and own.