As always, with any questions about Political Economy:

Follow The Money

I mean churches should be anticapitalist and before the turn of the last century they often were. But then property got expensive and churches would need loans... Now we have prosperity gospel and mega churches. The internet ran the same course but in just a couple decades.

Money. Plan and simple. The right wing is the side with all the money and they spend it on producing propaganda regardless of its economic viability. Just look at Prager U's financials. They pay dozens of content creators to pump out content even though it's not profitable. There's not enough money in the left wing to counter that.

Mind, I don't count Democrats as left wing.