Neutrality is good. Service suppliers shouldn't get to dictate how the service is used.

It would be as absurd as the postal service deciding what you can or can't write in a letter. Or black listing certain people from even being able to send or receive mail.

At minimum add NIP-05 :)

I am in the same boat. I actually started trying to use a physical kanban board I created in my office with cards for work and personal stuff. It hasn't stuck yet but it's an idea.