People will remain subscribed because a $2 increase every few months doesn’t feel as bad as a $30 increase in one go.

Frogs in boiling water and all that…

Okay then, that was always allowed…

The first time I saw this concept was in the sci fi novel Who Goes Here? by Bob Shaw back in 1977. The main character goes to a theatre that shows x rated adult films and children’s movies on the same screen, and what you see depends on which glasses you are wearing. Some teen tricks the main character into trading glasses with him if I remember correctly.