They brought "exclusives" to PC gaming for the first time.

Please stop with this horseshit. Valve and GOG had both done third-party exclusives before EGS was even a thing. Epic absolutely in no way "brought [them] to PC gaming for the first time.

Yes, they did make them a pillar in their strategy to try to enter a marketplace that was dominated by an 800-pound gorilla - which is a perfectly legitimate approach to take - which neither of the other two did, but they 100% categorically did NOT bring the practice to PC first.

they refused to spend any money on actually improving their fucking game store.

Wow, you're just full of misinformation on this post. They have constantly been updating their store since day one. No, it's not on parity with Steam (and it likely never will be), but to just flat out say that they haven't spent anything on improving it when there has been a steady stream of improvements over the years is ignorant at best and actively disingenuous at worst.