Sure, Epic hands out free games a lot but I've used Steam for around 6-7 years now, I've got plenty of games there, and feel like having many different programs with the same features and point to be a little pointless.

Plus you can often get free games for Steam from Humble Bundle, and Steam has sometimes put some games free to claim during a certain period.

Also I remember a site called steamgifts that I haven't used for years now (simply forgot about it) where people put their unused Steam keys up for giveaway and it automatically chooses a winner whom the giver has to send the Steam key or as a gift from their inventory. It's mostly legit. I won the game [PROTOTYPE] from there once.