This is just spam. It provides no value in the form of describing how you got the 50k users and is basically just an ad. Flagged.
Author here, as I mentioned in my post it was nothing but pure luck and building something that the community wanted but never had. I wish I had answers for you. Been an active hacker news reader for a long time and the last thing I would do is to spam a community where I get valuable tech news. Not sure why this was flagged but I am happy to provide video evidence and even show it live on a call if that makes you fe…
There is a reason it grew quickly. You could have provided value by diving into the ways (word of mouth, articles being written about you, etc).
Or if you had just done a normal show HN and described your product, it wouldn't have come across as spam.