With Zoom there are compounding factors. Software, video conferencing, video conferencing software, and software businesses are all topics in HN's wheelhouse—as is anything security or privacy related. There have been security and privacy surprises (shall we say) with Zoom in the past, so people are naturally hunting for more. Also, readers are primed to pattern-match any new findings as part of the ongoing sequence. That's a strong multiplier. Familiarity reactions—cache effects, if you like—magnify how much attention a story attracts. There was a similar, though slower-motion, sequence of stories about Facebook last year.
It's not a YC company.
When there's a major ongoing story, such as the current crisis, floods of follow-up and copycat posts appear, since every website and media outlet wants in on the action. After the Snowden deluge of 2013, we learned to moderate these counter-cyclically, so that HN can surf the big waves without getting totally sogged with repetition. The test for a new submission on a MOT (Massive Ongoing Topic) is: does it contain SNI (Significant New Information) [2]? If no, we downweight the MOT. If yes, we try to have one thread about each SNI. I just made up those TLAs.
Zoom has become a MOT in its own right. You can tell that when objections like [3..9] start cropping up. The question is: is the OP a SNI?
[1] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
[2] https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
[3] https://news.ycombinator.com/item?id=22749596
[4] https://news.ycombinator.com/item?id=22743303
[5] https://news.ycombinator.com/item?id=22748549
[6] https://news.ycombinator.com/item?id=22750059
[7] https://news.ycombinator.com/item?id=22750251