Tubi app has Fat Fiction for free viewing with short commercials. It was good enough to get my husband to sit and watch it after he wandered into the room. He normally doesn’t watch documentaries. More info here: https://www.imdb.com/title/tt11055922/fullcredits/?ref_=tt_ov_st_sm
Looks like it made it over to Prime as well. It is one of the better things to come from 2020 so far. Enjoy.