ofc mangago is illegal, its a pirating site. distributing pirated material is illegal and you can go to jail or be sued, however consuming pirated martial is more of a gray area when it comes to the law and it really depends on where you live.
I work in LE. Its illegal to distribute and download. Viewing the content online is not illegal. Mangago's owners could be legally charged, but viewing it itself is not criminal.
And am i gonna get in trouble if this server gets found out about?