Due Diligence: Investor/Trader or Exchange

[Woodie]

A few years ago when we had ICOs the responsibility of due diligence fell on the investors to try and vent out the bad projects from the legit ones

and this worked 80%( Percentage could be higher or lower) of the time, but then came IEOs which were a fundraising process which was/is done

by an exchange which meant we had less shit/scam projects because the due diligence pretty much few on the exchange itself.


Now in cases were an exchange delists a coin which was introduced to us through IEOs are they not responsible for any of our losses?
Do these exchanges conduct their own due diligence before listing a coin on their exchange?

Is Due Diligence still necessary these days...?