I'm betting they will go back to paid versions, if itch pulls its head out of its ass. I think with the itch censorship disaster, this is an attempt to boost exposure, since the platform will reindex all games if they are free with no pay options. Sadly steam is also doing the same censorship BS
To be fair to Itch and Steam this is because of threats from Visa and MasterCard, and if either of those payment processors refuse to do business with you than you're just screwed.