It's like a bizarre network of bad pirate streams, when one goes down someone starts another. Kodi plugins in this context generally just refer to pirate streams.

Torrents: downloading is a lot easier than simultaneous live streaming to many people; this is why many streaming sites moved from something like RTMP to HLS/DASH/etc - instead of a persistent connected stream, they just upload small video files

Plexus and Sparkle are the Kodi plugins you want, it scrapes the *Streams subreddits for Acestreams.