I don’t know munch about business but it sounds from all parties concerned like they could easily (i) introduce API pricing at 20% of what they want to charge n

I don’t know munch about business but it sounds from all parties concerned like they could easily (i) introduce API pricing at 20% of what they want to charge now, (ii) give a three-month runway so app developers could turn up prices and generate revenue flow ahead of sudden outlays, and if they really wanted to milk it (iii) serve ads alongside content in the API. That has the benefit of generating revenue higher than the cost of running Reddit, reduce the opportunity cost of not having people on their own platform but still generate a neat profit. People would complain a little about the cost and a little about the ads but it would be fine.