Google introduced a noise-canceling feature a while back. The feature is designed to optimally filter out background noise and improve audio transmission. So far, however, the whole thing was only reserved for users of certain workspace versions. Google is now adjusting the setting and allowing use if the meeting host has a valid subscription or you join via Google Meet hardware.
If the participant has a valid subscription but the host does not, then the function is of course also active for the participant. Do you use Google Meet for meetings or are you using other tools?