The Freedom app has similar options where you can disable turning it off during a session or even disable Task Manager / Activity Monitor while it's active too.
I eventually found the pricing section...the green bit at the bottom, after 'try for free', behind 'freedom premium'.
Thanks to my off button (and several comments herein), i now so much more appreciate how my off button is free.
As in cost to use, and availability.
https://freedom.to/
Anything that pisses me off works. Usually that's fully logging out of an app in a browser and not using any mobile apps.