I watch many youtube channels with 100Ks of subscribers. Those creators are not out there spending resources getting an audience and those audiences are not coming from personal connections - the platforms are facilitating the connection.
Re : how "attempting to work in the art world" works : this is a very interesting subject/discussion - at what point is someone regularly publishing entertaining youtube videos about small engine repair "working in the art world"? When they get enough income to quit their day job or some lower bar - I dunno - both ? neither / never?
Re stardom: what you're saying is 1000 true fans != total number of fans/casual followers. Agreed.