There has also been a significant influx of streamers who previously played Overwatch. My favorite streamer, Holiwhirl, was a well-known GM Overwatch streamer for a long time, and switched to playing Apex at pretty much exactly the time that I did, at the beginning of season 7. She's brought a lot of her old friends in and at least one of them has taken to also streaming Apex instead of OW.
For many big name Overwatch streamers, Apex has in the last few months become one of their primary go-to games when not playing OW. Apex has been good for them since OW has not had any new content in forever, and it's good for Apex that their viewers see them playing and enjoying Apex. I even noticed that EA sponsored some how-to vids from KarQ.