An anecdotal suspicion only (sample size = 3); I don't have any data as evidence except what's stored in my own memory.
The submission YouTube Premium is getting a big price hike internationally [1] from half an hour ago rocketed to ~34 points within 30 minutes, then mysteriously stalled and got zero new upvotes from minutes 30 - 40. (I totally get that could happen to absolutely any post or purely by chance, but just seems sus).
Two other posts I noticed this happen to were YouTube deletes LTT video for teaching people how to live without Google [2] and Google removed 'number of results' default setting for some users [3].
Both got large numbers of upvotes in the first 30-90 minutes but either got slammed by downvotes or flags shortly afterward.
Perhaps something for @Dang to investigate.
[1] https://news.ycombinator.com/item?id=41626035
[2] https://news.ycombinator.com/item?id=41466182
[3] https://news.ycombinator.com/item?id=41466138