Copying my reply to someone else:

Epic is anti-customer: https://medium.com/@unfoldgames/why-i-turned-down-exclusivity-deal-from-the-epic-store-developer-of-darq-7ee834ed0ac7

Tldr: Kickstarter Game with a lot of interest while in development announces a release date on Steam. After the date announcement they get contacted by Epic saying “we’d love to host your game” for an exclusivity deal.
Dev responds that they would be happy to have their game on Epic but promises were made during crowd funding that it would be available on Steam.
Epic replies that they aren’t interested if it’s not exclusive.

This tells me that

1. Epic is full of shit. "We’d love to have your game, but only if it’s exclusive.
2. Epic doesn’t care about being a better service for its customers. Having the game available on Epic as well is strictly better for Epic’s customers and they easily could have done that. They chose not to.
3. Epic is not interested in actually having to compete with other companies. This would require them to provide a better service in some fashion. They are only interested if they can force people “if you want to purchase this game you have to buy it through us” which is anti-consumer.