How to turn off AI Training of your content on Web and Mobile:
On a Web Browser:
I had some trouble finding this option. My first instinct was to click the settings button on the left, but that's where it is!
First, you'll click the name of your blog on the left sidebar to bring it up on your browser.
Then click "Blog settings" on the right sidebar once your blog is brought up. That's where they're hiding it.
Click "Prevent Third-Party Sharing" under the Visibility section, and bam! You're done.
On Mobile:
Thankfully it's much easier on mobile. Just click the Gear icon on your blog's page, to go to settings.
Scroll all the way down until you see Visibility, then toggle the Prevent third-party sharing option for your blog!!
If you disable this setting on mobile, it automatically synced it to my web browser settings, too. ...But if you use both Web and Mobile, I would still highly recommend double checking that it actually turned off on both!!
Check that it's turned off on your side blogs too! And check your settings every now and then anyway to ensure that it's staying turned off, because if my memory serves right, some other websites will pull some shenanigans on things like this and opt you back in without telling you!
And if you have the option to poison your art with Nightshade or Glaze, keep it up!!