I've never had any issues with Steam. Of course I don't buy old games from Steam either. If it's old and not on Abandonware to where I can legally download it, then I know someone is trying to rip me off.
Having said that, I don't trust Steam as far as I can throw them. I have all my purchased games triple backed up off my PC. There will be a day Steam stop existing (to pretend otherwise is foolhardy) and I won't be left with the short stick.
In fact, pretty sure Home World is abandonware, I have one of them because of that.
Edit: Yep, it is, and so is two.
https://www.myabandonware.com/game/homeworld-3zy
Edit2: Oh GoGs greedy ass has it claimed. Goddamn I hate GoG. They are the world's worst at claiming and reselling Abandonware, which is why the rightfully get pirated so hard. Glad I grabbed it before they did this, ****ing ****s!