> Side question: I'd like to stream some audio content to a few 1000 people (24/7)

Hm... If you don't want to build your own streaming infrastructure, then it looks like you can have a 24/7 youtube live stream: https://support.google.com/youtube/answer/2853700?hl=en

"End times are not needed for 24/7 streams."

I guess youtube isn't very suitable for audio, but maybe it is an option for you.