New day...opening my Catalina and paying attention to the fans (yesterday I have tried another potential fix with multiple kill commands as suggested in this forum). Fix worked yesterday throughout the entire day.
Guess what? Problem is back. That's so frustrating. A $2,500 piece of machine ruined by a crappy update.
It seems all remedies and workarounds suggested here fix the issue for a while but it returns one or two days later.
Looks like those fixes are just interrupting something buggy in iCloud account sync and, whatever its cycle be, next time it triggers a sync or any cloud process, the accountsd process gets crazy again.
This isn't funny Apple. Considering the number of reports here, different machines, different iCloud accounts, different Catalina versions, it it a serious bug that needs to be high priority.
Not all users are skilled to open Activity Monitor and note there is something going on in this process.
I bet most of ordinary users panic with crazy fans and bring their Apple computer to the store.
The usual "Plan-B" suggestion to reinstall MacOS is really a shame since if the accountsd process is faulty a reinstall won't fix it anyway. People will spend time visiting Apple stores, reinstalling their Catalina and, after a couple of days, problem returns.
Apple, let's fix this for good!