What we are witnessing now signifies the end of era zh chess com.
I think something similar could happen to bughouse. Even when it appeared on the main site, there were constant glitches, and they have been happening all these years.
When people ask about variants server, they probably don't know that it has been in a rather raw state for several years.
This is all very strange considering the recent Crazyhouse and Bughouse World Championships, where many GMs and NMs played, as well as the BWC with commentary by Yasser Seirawan on the stream.