An online comedy video accreditation puzzle

The Internet provides a wealth of comedy videos for us to enjoy and a site called Instagram has an algorithm which presents me with many. But some of these videos, unlike my own, appear to be the product of a team effort (discounting whoever built my apartment as a member of my team, etc.). There are actors in the sketch and I suspect others are writers and people who do graphics for the video. But these others get no accreditation. But surely they want accreditation and some may even think it is an injustice that they are not accredited. Why do they do the work then? One explanation is that someone pays them and the money compensates for the lack of accreditation. Another explanation is that they cannot get creative jobs which give them accreditation, on reasonable terms anyway: you only get them if you are a part of a social network and they are not. A third explanation is that some of these comedy videos copy their main idea from other videos and a process of accreditation would require crediting the original source, which they don’t want to do. There are probably other explanations.