Do not, under any circumstances, track usage of your plugin A plugin is a piece of software containing a group of functions that can be added to a WordPress website. They can extend functionality or add new features to your WordPress websites. WordPress plugins are written in the PHP programming language and integrate seamlessly with WordPress. These can be free in the WordPress.org Plugin Directory https://wordpress.org/plugins/ or can be cost-based plugin from a third-party without explicit consent.
If you want to ask your users if you can track them, by all means ask. But you may not require it, and you shouldn’t make it look like they have to in order to use your plugin. That’s being dishonest.
This has been a guideline for a very long time, it’s not negotiable. Assume people do not want to be tracked and have it to be an opt-in feature.
If your plugin uses Google Analytics, emails you on plugin activation, triggers some complex check on your servers when a plugin is updated, or tracks usage in any other way when a user has not clearly said “Yes, I allow you to track me,” your plugin will be removed from the repository and you will have to correct this in order to get it back.
This extends to ads provided by a third party service. If your plugin includes advertising from a third party service, then it has to default to completely disabled. This is to prevent tracking information from being collected from the user without their consent. Again, this is all about people opting into being tracked.
(For those thinking about using Adsense, don’t. Re-read their Adsense Display Guidelines and note that they do not want you to put ads on non-content pages … which is what the whole WP Dashboard is.)
Don’t assume that just because someone said they agreed to have usage tracked by you that they’re okay with usage tracked by someone else. Don’t be shady or vague. Tell people upfront “This is who will get the following data…”
Remember, user trust is paramount to your plugin’s success. If people find out you’re sneaky tracking them, you will lose that trust in a heartbeat and there’s nothing anyone can do to help you restore it.