Because I’m not hoping? 
I assessed the situation, recalculated multiples to get valuation metrics, spent a weekend on deciphering an earnings call, found it to be extremely oversold when it touched $40 and added based on my preliminary conclusion, took in everything from investor day, looked at earnings calls from a few other companies, and so on, and well… feels like I’ve spent two weeks analyzing and that Matthew Prince owes me a vacation.
Such an amount effort might be a good reason not be overweight in a stock, though. 
Of course, NET have a problem with staying put, so eventually it forced me to trim it back a bit. Whether it’s “the best place for money” where it sits now is another question.
I have a strict requirement for anything with high allocation, namely passing my test for “what if just forgot about my portfolio for five years?”. So I take multiple timeframes into account, and also put emphasis on “know what I’m holding”.
In short, I’m holding it based on my current assessment and understanding.
Edit:
Found this reply to be unsatisfactory, so expanded on it with an actual assessment. Adding a link to it, since it’s buried in a long thread:
https://discussion.fool.com/t/cloudflare-s-use-of-databases/92465/8
Also, a clarification: “found it to be extremely oversold when it touched $40” didn’t come out right. It was meant to refer to investor day - i.e. a point in time, and to capture that I did no longer view this to be a case of disastrous results. “Oversold” was a poor choice of words.