They are already selling data to midjourney, and it's very likely your work is already being used to train their models because you have to OPT OUT of this, not opt in. Very scummy of them to roll this out unannounced.
here's some instructions for anyone who doesn't know how to opt out:
- login in on desktop, it's not available on mobile yet
- click "Account"
- click on your blog
- go to "Blog Settings"
- go to "Visibility"
- Scroll down to the bottom option
- turn the toggle ON, not off
you will have to do this individually for each sideblog you have too, no way to do it for each account in one go
I just did this on mobile, so you can actually do this on iOS mobile, at least.