It is probably a lot easier to be anonymous these days in music. And getting to number 1 isn't as big a deal - there was a time it felt like knowing who was big in the charts was unavoidable. They were on the one radio station you could tune into, on the chat shows on the few channels you could get, be on the back of the newspaper or magazines where you got all your news. Sales are much lower and it relies on streams. One hit wonders in the past there would be some kind of expectation to follow up with something, that would create interest in itself and airplay. If it flopped, people knew about it.