All very excellent points @Secretariat415 nicely done.
IMO the article pointed to a very critical component that deserves some ranking and you touch on a little on that in your #4 view....
from the article:
Who are the people behind the cryptocurrency? Are they trustworthy and competent? Are their names and resumes published for the public to review? Do they have a Google trail of promoting other scams? Do they have an experienced technology team behind the cryptocurrency? These are some of the questions that should be clarified by an investor towards any given prospective venture."
So as the price of bitcoin continues its trajectory, more and more opportunities are being presented to inexperienced "investors" who have seen easy success and expect that success to continue, regardless.
An interesting one that has been postponed is Tim Drapers Tezos - https://www.tezos.com/. Have a read at how well that puppy is being executed.
Thanks for the great comments @Secretariat415