A recent example of Epic exclusives was Borderlands 3. It was highly anticipated, and then it came out that it would be exclusive to EGS for 6 months. I refuse to use EGS (for my own reasons), so when the hype died down after a few months and it arrived on Steam, I forgot to buy it. In fact, I still keep forgetting.
I get free games every month with Amazon Prime. I can only use this via the Twitch launcher (doesn't even work on Linux AFAIK).
Borderlands 3 I bought when it came out on Steam, I believe in start of Steam release it was on sale. Else I wouldn't have picked it up, simple as that. They release DLCs for the game, so that's nice, and keeps it a little bit alive I suppose.
Guild Wars 2 recently launched on Steam (like 8 years after release). I cannot merge my Guild Wars 2 account to Steam though, so its useless to me.
Humblebundle, in contrast to platforms like EGS, yields you serials you can apply to a launcher, usually Steam. That's convenient, but I suppose it isn't for people who don't want to use Steam.
Though I'm a heavy Steam user, so Steam being the defacto standard is fine with me.
I don't want another launcher, therefore I either use Steam or use Lutris to abstract all other launchers (and emulators and such).
