Does this janky thing count? www.blueskywizard.com
More coming though...

...but can you auto-follow 1000 people with the "ADHD" keyword in their profile?

Very understandable! However, the code for that site is fully viewable:
(from Chrome) you can go to:
view-source:https://www.blueskywizard.com
as well as:
www.blueskywizard.com/blooski-clie...
And you can exactly what it does with your credentials!

And yes, on here you can search, but can you...

I made something that lets you inject a bit of chaos into who you follow. But whenever I try and link to it in this reply my post doesn't show up!