Exactly. Epic's complaint is that steam has such a large user base that they can get away with the percentage they charge, but nothing is stopping people from having every game selling storefront at the same time. Steam doesn't do crappy stuff like exclusive deals with other companies to draw people in.

Now I only used Epic for a couple years, but I don't remember them doing sales. They did the free stuff which was mostly shovel ware crap, and their games stayed full price. I get games regularly at a discount on steam, which is a better deal as a user.

Epic is just whining that their terrible approach isn't as good as steam's.