>>1775875In the business world we have a concept called "risk management"
Basically, you can be certain that something will happen that you could not foresee or plan for. You want to ensure that, to the highest degree possible, you avoid situations where a failure to completely control all possible outcomes results in something harmful to the company, or anticipate and prepare for outcomes you don't want.
A bad outcome of livestreaming a drawing contest is someone sneaking something offensive into the livestream. The consequences of this can mean a violation of youtube's content policy and the algorithm automatically terminating the channel, with a subsequent appeal being denied because, whether deliberate or not, Cover failed to prevent one of their channels from violating youtube's policy.
Is the benefit of a community event stream worth the very substantial risk of someone finding a way to sneak a yab past your best laid countermeasures and ending a talent's entire career? The answer is very, very simple.