Thanks for the heads up on this. FYI, we have an uninstall.php script, but I it hasn’t been updated to do so across multisite installs. You can only “delete” the plugin once and it will clean up whatever site you initiated that delete from. We can probably code that to search through all sites looking for signs of PMPro to remove. We’ll need to add a few extra big red warnings/checkboxes/etc to make sure people are aware they’ll be opting into having data removed.
It’s been a while, but if you’d need an idea of what to do to clean up PMPro data, here is a link to the uninstall script: https://github.com/strangerstudios/paid-memberships-pro/blob/dev/uninstall.php
