Yes metrics! almost all bigger and mostly premium plugins but also Spigot and paper have build in plugin metrics.
MCG didnt have much except for starcraft which had the old bstats.

Currently all plugins from MCG will be including the Bstats New Metrics system the think this does can be seen below it basically shows the amount of servers an players using it completely anonymously.
and you can turn it off if u turn it off however it turns it off for all plugins using metrics.
so if u already disabled it before it will be disabled now.
Take a look below all stats are public below.

Note below metrics started from 10-2-2022