I've looked up a few things about different partnerships and I found 1 video that gave info about a lot of popular networks on YouTube. The one that I liked....yet I can't get into yet is TGN. I liked it because, like you wanted, they don't ask for daily videos of intros....however, to join them, you need a minimum of 1k subscribers. Which unlike some networks nowadays...is a bigger requirement.
Although, some people find that great. There are a lot of networks where it's super easy to get in.... however their contracts and conditions and stuff are not that good. People say that that's because a lot of networks only care about the amount of money they make and the amount of people that join....the numbers basically. But the networks that have a higher requirement, suggests that they're looking for people with good content, who know what they're doing and have a great chance of becoming more popular in the future. Of course....we don't know everything. They only tell you what you want to hear....but that's not all they offer...I'm sure.