Those two events have nothing to do with each other.
In Paypal people send each other money, and the man in the middle is blocking it.
In YouTube, Google decides whether or not to put ads on your video and give you part of the money. You aren't entitled to that cash just because you uploaded a video and people saw it.
It's still terrible and irresponsible for YouTube to be arbitrary about it and have no clearly defined rules; it's clear they're unfair. But I don't think the comparison with PayPal makes sense.
Slightly off topic but PayPal doesn't just block it, it seizes the funds entirely for a long period of time. In any case, you're right, YouTube not advertising on videos is not at all like PayPal stealing payments.
