Back in the day how did you find new music? Pre-2000s it was likely MTV/radio for mainstream, or word-of-mouth/local events for niche genres. Nowadays Spotify and streaming services have supplanted the former for mainstream music. Finding new music outside the recommended engines requires a little more effort in knowing where to look. There are a lot of Internet radio programs (shout out to The Lot and Rinse.FM) and smaller record labels that do an amazing job at curating local and diverse sounds.
These days it's never been easier to start your own label or publish a track. Rock-'n'-roll is probably still alive (unfortunately I don't know that modern scene well), but assembling the necessary equipment and people to start a band is a big hurdle requiring practice, space and coordination. So I can see more wanna-be artists opting for pop/electronic having shorter turnarounds to a finished product.