Developers being paid to make games sounds great. Why is Epic a bad guy for paying developers?

Because making content exclusive to a single platform is not adding value - it is removing value from other platforms, and as such is a net negative move.

It's not though. There is nothing inherently negative having to use EGS compared to any other game hub. There is absolutely nothing negative about giving developers more money to make more and/or better games. It's a net negative to take 30% from developers doing the actual work.

Pay for studio to make game exclusive on store, how is anti-competitive? (Possibly the store might be BS but it's not anti-competitive matter)

How is any of that anti-competitive? It's a fair competition between multiple app stores.

And Epic is also competing with Steam by having lower cut (5 % versus 30 % IIRC) leaving more money for the developers. It's good for the developers and consumers both.

That sounds like a gigantic win for developers to me.

It's a "gigantic win" for everyone in the same manner that Uber paying drivers and customers (via bonuses / free rides) to use their service was one for everyone involved . Sooner or later, Epic will have to stop doing this once they get their market share and there is no guarantee that this will be the financial model they follow (free games frequently, paying devs to be exclusive etc).

It works in a different context ( platform exclusives ) because the lock in / costs to developing for a different platform are far different from that for different stores on a single platform.

Good for dev. Even good for end user since they are throwing money into easy bait like offer free things to user just to use the platform.

But I would refrain from investing much more into the platform since what Im seeing right now isnt going to sustain the platform in the long term.

Its one thing if the store has distinct feature like gog, but theyre not. In the end I(and many others surely) use it just to get free games.