The post I was replying to was saying

people will stop using it for all the things they're currently using it for

They will when AI companies can no longer afford to eat their own costs and start charging users a non-subsidized price.

i.e. people will stop using AI when user have to pay the "real" price (what this is is left unspecified and an exercise to the reader to figure out). My point was that even if the AI price from those provided to infinity AI usage wouldnt drop to zero like they imply.