This pattern is "easy" because it's hard to actually profit from it. Consider the options:
Shorting. So you need to borrow shares and watch out for borrowing rate. Furthermore, the "apparent easy" slow money part is counteracted by potentially explosive multiple 100% (or historically potentially worse) gaps. Dealing with those either requires incredibly careful position sizing (and huge numbers of positions to make any money) or being long calls - similar to next paragraph. Better left to algos than discretionary trades IMO.
Long puts. Assumes you can even buy puts in the stock at reasonable spreads. The problem is, everyone selling them knows the stock is going to shit and puts will be priced accordingly - no free lunch.
My suggestion: Do some backtesting on these, and you will see the no free lunch aspects. At least, after doing this kind of basic sanity checking is why I haven't ever shorted shit stocks yet. If I just did it blindly, it would seem to work great for a while and then one day I would be wiped.
On the flip side, I've heard traders refer to this as being maybe the best easily available edge out there for retail, since the complicated part is implementing it, not spotting it.