Not all YouTubers have Patreon or accept direct donations. They're not beggars, they're content creators. Some people want to earn money, not just get donations. That, and there's the mess of taxation to deal with etc. - pay slips are an easier way to manage that.
Not to be picky but I hate when people refer to people on youtube as "content creators". Very very few people on youtube qualify for that title. There's gotta be a new word for youtubers that reflect what the majority of them are...