I have seen the AI massing Flingbeacons in one System multiple times now. On the screenshot it´s only a moderate number. Given enough time it looks like there is a ring around the System if you zoom out enough.
Maybe i am missing out on some advanced fling beacon technics but i don´t see no benefit from massing them like that, instead it just cripples their income.

I think it´s kind of a bug.
Hope it´s ok to report that here, since i´m a gog copy user i can´t access the according steam forum...

ps.: Is it possible to add a button to deactivate the symbols of planets and stuff? It kind of takes away the "epicnes" in a battle with all the cartoonish icons in the background.