I built and maintain an email service that has a no ai policy (https://sciactive.com/2026/01/21/our-stance-on-ai-in-email/):

https://port87.com/

Also, all of my open source projects (https://forge.sciactive.com/sciactive) use my SciActive Human Contribution Policy (https://sciactive.com/human-contribution-policy/), which bans AI contributions.