You're phrasing this as if Epic is going around making all these poor developers do their bidding - the developer is agreeing to list their game as an exclusive.
Be mad at the dev for making the choice to host only on Epic Store if you're upset about it - they're aware of the consequences and could have easily gone with Steam instead.
Be mad at the dev for making the choice to host only on Epic Store if you're upset about it - they're aware of the consequences and could have easily gone with Steam instead.