they're all pathetic pieces of shit really, they have a mixture of really loveable and hateable qualities.
the situation is a bit more nuanced, the guy filming, RobZilla, got Lenny a job working as a bodyguard at a sexclub. Problem is that Lenny is highly addictive with sex/drugs, and despite supervision, he OD'd on something synthetic.
RobZilla manages Lenny's channel and is the only reason he is producing content, and so Lenny asked him if any thing crazy happens to film it for content.
It's a fucked up relationship, although Rob provides Lenny with stability, giving him with a steady job and manages his Youtube, he's also highly exploitive and puts him into destructive situations.
Of course, Lenny is also incapable of both standing up for himself and doing anything himself, bottom line he needs someone to care for him, it's really hard finding someone with good intentions to take care of a super destructive 300lb freak.
Not to mention the only reason why we're getting content from Lenny recently is because he's back together with Rob