My question is this:

The founder invested the money that financed the project in other ico during 2018 and he lost everything

Which ICO is this if you have proof mate?this is important in this case if you can mentioned which is which.

The project is now closed without having posted a financial report or proof of work in 3 years.

this must be clarified for transparency and very important to the investors 9If there are some)

He didn't even publish the names of the team members .

Do you think it's a scam or not?

The way i see it?there is a Big possibilities that this is intentional and may called scamming.