I go through a couple of roundabouts on a two of my weekly rides in two directions. I haven’t had any challenges with people stopping in the roundabout. Most seem to know once we’re in how to handle themselves. Almost every other week though where someone new to roundabout etiquette just doesn’t know how the right of was works which can get awkward. Have had a few minor challenges with both motorists and other cyclists.
Normally we have a pretty good sized group going in and out but often solo as well.