It's the same with e.g. faceapp, fun for a minute but then... then what?

And this is the challenge that these tools have - they have to have a free tier to get people to explore it, but unless they can make it a habit, those people will never upgrade to a paid subscription.

I have no figures, but if I'm being optimistic, these freemium subscription services have 10% conversion rate at best; can that 10% pay for the other 90%? For a lot of services that's a yes, but not for these video generators which are incredibly compute intensive.

I'm sure there's a market for it, but it's not this freemium consumer oriented model, not without huge amounts of investments. Maybe in 5-10 years, assuming either compute becomes 10-100x cheaper / more available, or they come up with generators that run cheaper.