Whether the power ledger is a SCAM or not, I have heard the news that the ledger power is a SCAM project
Is that true?
You hear a lot of things "in the news".
No one can guarantee you anything, but it is a real, registered and renowned company behind it, so the risk losing a legit company if they would pull a stunt.
So you should draw your own conclusions, but at least it is one of the most measurable and tangible project in ICO-land there is.
ICOs are always a risk, but in my mind this is the one having the least risk tied to it
How delusional can you be? Registering a company is a trivial ask. They are not risking anything because they don't have any reputation. Investors are the ones taking all the risk by donating money to some shady company with a crappy idea that has close to 0% chance of success.