The fact that autoplay makes for better retention of gamblers is not a long term asset; Autoplaying means it is straight up games of chance, and casino gambling is usually regulated differently from games of skill.

Acording to a recent estimate, something like 0.19 % (https://news.ycombinator.com/item?id=11354546), and given the type of f2p under discussion, "the autoplayers", that fraction should be compared to something like the the rate of gambling disorders in the US population (around 1% for adults, 6-9% for youngsters http://www.ncrg.org/sites/default/files/oec/pdfs/ncrg_fact_s...)