As a customer, if the game company has better chances of surviving paying their employees a decent wage, making quality games that I can enjoy, I'm interested in the game being exclusive.
As a customer, if the market could have more store options other than Steam so prices can be more competitive and developers can choose better deals, I'm interested in games being exclusive.
Also as a customer I can decide to just not play the game because of exclusivity and move on.
Why is Mario not on Steam? Why is The Last of Us or Uncharted not on PC? Yeah it sucks games are not ubiquitous but it's not always in the best interest of game developers to distribute their games everywhere and I think it should be perfectly understandable from the point of view of customers.
Also, from the point of view of Epic, I guess it's expected they want something in return for funding projects.
I don't get the anger people direct towards Epic when in fact they are doing a good thing for the market that very few companies would have the power to do.