Yeah, I can't find anything about cost, and I'm sure there will be a cost involved. Makes me question their viability.Like this?
Puffin Flash Store allows users to enjoy playing their favorite Flash games on their existing browsers without installing additional applications. It's based on CloudMosa's flagship web isolation product which ensures user's web safety when playing Flash games.www.puffin.com
I couldn’t find the cost, but it might be a good alternative if ruffle needs a little more development time.