First moved out in the early 00s, rent was anywhere 75-150/w depending. Friends had 2 room units in complex for 95/w. Not even 2 or 3 years later rents were at 200-250/w. Now those same units wont be under 400.
I know airbnb and such arent the sole reason, but when they can rent out their house where nightly prices 350+ where rents are at least 400/w they can rent the place for not even 2 months a year and get the same as if they were renting it out the traditional way. So, naturually there are less longer term rentals available, pushing prices up. We have whole towns which are tourist areas where people cant get a house to live in because of airbnb shit. I'll liikely never own my own home because im paying at least 65% of my income on rent, how the fuck can i save. Fuel, food, energy. Everything going up except wages.
You can add non-steam games to steam if thats what you mean. Theres a launcher called hydra which does, things. Playnite is a launcher I use that I plug all my other accounts in to and launch all games thru that. There are also ways to unlock dlc and stuff but that will require a little bit of research. Havent sailed the seas for games in a while.
TLDR; Yes you can add otherwise aquired games to steam. For the most part