Not all Part 15ers stream and vice-versa, but the two are complementary. Part 15 AM can reach thousands of people, assuming they’re real close by, and streaming can reach only a few people depending on bandwidth, anywhere on earth and probably on the space station.
This wonderful Part 15 web site has the most professional and generous sharing of knowledge, there’s no jealousy or secrecy about discoveries and experience, which is why the website is possible.
To the best of my awareness there is no similar website for audio streamers, although it sure would be helpful, but the game is probably more competitive since there are tens-of-thousands of on-line stations whereas the Part 15s are few and far.