$10 a year doesn't cover the estimated $2.50 per user per month cost after the API changes go through (especially considering Apple's cut). That estimated cost is also substantially higher then the estimated revenue reddit gets per user.

The issue isn't that third party developers now have to pay for API access. That was a long time coming, and I don't know of anyone opposed to this. The issue is the price seems completely unreasonable, and the time frame is ridiculously short.