FYI, Stylish sells user data to ad companies as of around 18 months ago. I think I still have an old version for Chrome somewhere that I could upload for you to get around it. I'll have a look for it tomorrow.
https://www.greasespot.net/p/privacy-policy.html
It seems fairly standard.
We may collect non-personal identification information about Users whenever they interact with our Application. Non-personal identification information may include the list and/or number of installed scripts, the source they were obtained from, metrics describing usage of the Application and User behavior and Telemetry, and other similar information.
We do not sell, trade, or rent Users personal information to others. We may share generic aggregated demographic information not linked to any personal information regarding visitors and users with our business partners, trusted affiliates and advertisers for the purposes outlined above. We may publish aggregated statistics based on this information online.
So basically they can "share" bulk user data with others, but don't sell or trade it. What Stylish started doing is a lot different and people were very unhappy about it.
Nice. I just couldn't take another minute of orange. The search term "universal" is a god send. I'm going to end up changing a few things on this here and there on this but it's pretty good right now.