Just like OpenAI did for Shutterstock before they released DALL-E.
https://www.shutterstock.com/press/20435
As for individuals, once the licence fee is paid I expect Stability AI to remove infringing training material (with artists requesting to opt out), update their model significantly and publish a new an improved model that (perhaps not completely guaranteed) convinces individuals to switch.
This may be in the form of an updated hosted model on Dreamstudio. Although for the open source model, well this is in muddy waters.
Maybe this isn't going to happen with all individuals but with the mess that Stability AI created for themselves that is the consequence of prematurely releasing the model trained on copyrighted material and getting caught for it.
https://techcrunch.com/2022/08/12/a-startup-wants-to-democra...