Hello, Lichess. We have some hourly ultrabullet arenas, which don't interfere other time controls, but usually players create their own ultrabullet tournaments, because hourly ultrabullet happens rare. But creating a tournament means that one has to wait 5 minutes (time to gain participants) before the beginning of a tournament. But most people just want to join already going tournaments and not lose time on creating or taking initiative in creating a tournament. Although, if there is some ultrabullet tournament (especially official arena), a lot of people join it. It would be therefore a nice improvement for ultrabullet players if we had more official ultrabullet arenas (they don't interfere with other time controls anyway). Thanks.