price spike is not going to happen suddenly. it will be the last step of a long rally or series of rises.
for example take the last rise. it basically started at $200 3 years ago (2015). it slowly went up to higher values that took about 3 years until 3/4 of 2017 then the "spike" that you have in mind occurred. and that is where you want to sell not the previous rises because that last big FOMO buy leads to a bubble and an unrealistic price (that was $20k) and similarly you want to buy bitcoin when it is underpriced at an unrealistic lower price (that is $6k).
something tells me this can happen again and most traders if not all will refuse to buy our BTC If BTC spikes again !...
do you even know how price rise and "spike" works?!!
in a market there is a buy and a sell. when there is more buys the price goes up. in other words price doesn't magically go up! it is people
buying the asset that causes the rise!
the thing you quoted is just talking about shittiness of exchanges that have weak servers that can not handle large requests. it was NOT a DDoS attack but simply a surge of demand. Coinbase for instance reported 1 million new users registration in a couple of days during that spike time.