The cost of 0,00024 per request seems reasonable, and according to Apollo’s creator the cost per app user would be just 2,5 a month. Keep in mind that currently this app probably has no incentive to go light on the requests, so with some tinkering the creator could probably get that down. Maybe some proxy caching or what not.
Of course free is going away, but paying users at say 5/mo or 50/yr should still work for Apollo.