While right in general, not really the case here. Keanu couldn't even make his own band famous or get a big label to sign them. Opening for Dogstar isn't really that big of a deal, hence why a band was able to do it in their first show. Bands established in the music scene were not opening for Dogstar. No one was bragging about being billed alongside Dogstar. Playing with Dogstar didn't mean you were connected or knew Keanu. They were not a big deal that bands were fighting to be billed with.

Weezer weren't signed until later and it was based off a demo that is really fucking good. They signed to a record label much bigger than any Dogstar was ever on based on the strength of that.