I saw "What are the safest investment strategies for "long-term" (4+ yrs) profiting in volatile crypto markets?" appear under example questions.
I think it should be off-topic.
Questions about HOW to buy/sell/transfer/use some cryptocurrency would be on-topic, but WHY to buy/sell or strategies to buy/sell would not be.
Discussing investment strategies or price performance would be off-topic in most contexts.
"Why did the price of X go up?" - off-topic
"Why did the fees on X increase?" - could be on-topic, example A: because the price went up and software didn't adjust the fee amount in native currency, or, A: increased transaction pressure caused the fees in native currency to go up
They should be off-topic for two primary reasons:
Any answer will soon be out of date or not applicable to the next user. This has a chance to bring about a lot of duplicate investment questions and clutter the site.
I constantly find myself wanting to ask questions about why cryptocurrencies crashed suddenly, or jumped suddenly at some points in time, and have sadly had to resist it because the existing SE sites didn't allow it (and some of them don't even know why, they are just thinking as if it's StackOverflow where recommendations aren't allowed, despite the crypto site being independent and allowed to allow recommendations just like the Software Recommendations SE or Hardware Recommendations SE).
Allowing these questions will allow the site to attract a huge turnout and a healthy-sized community, comparable to some of our biggest and most successful sites like AskUbuntu or Physics.SE.