that list is horribly outdated - so many of the grids in the list dont exist

Most people these days run their own grid through the dreamgrid installer. that actually increases fragmentation

and then the testing grid , osgrid, is down for multiple days every few weeks, which alienates and frustrates new users . overall activity is down, despite the pandemic. and my experience is that it's very very hard to keep users interested because it is lacking the critical mass of people. It also suffers from very high levels of drama

i find it very hard to believe that decentraland will keep such high numbers for long, it has received enormous coverage in the media eventhough it's bordeline a scam (imho). opensimulator has not received any of this

I dont think metaverses should be compared with mmo games - they are different things and attract nonoverlapping crowds.