For months before this pandemic, GCM got multiple new user accounts per day, even though most of them never posted - just a continuous flow of new user accounts on a daily basis. This was odd in itself because that was never the case in times past. Kind of like someone was intentionally trying to grow the new user numbers.
So when the lockdown started, the daily multiple new user accounts stopped cold. Looks like during a pandemic, when people are confined to their homes, with beaucoup amounts of time on their hands, we'd get new users just by default - but no.
So the person who was evidently trying to grow the number of new accounts by large numbers has stopped during the pandemic.