I've been getting them for years now and have enjoyed many of them (though not a large percentage), and would love to use the Epic store more, if only they would implement some version of reviews/scores. Without that, I feel that I can't trust them as a marketplace.
I've gotten numerous Android freebies. Unfortunately there's no discoverability for their mobile app store: no profile, no owned game list, etc; just the occasional game in the store that shows a different button (owned vs free vs paid). Keep track of what games you own so you can do a search to install them when you feel like playing one, because there's no other choice.