I've tried to create or revive a watercooler channel in every remote company I've worked in last 10 years. For some reason it usually doesn't work. Some people don't needed it, some people just call each other and vent out privately. I miss watercooler talk.
TBH one of the best part of watercooler talk was the limited range (only the people who're there) and no trace of the exchange (all verbal)
We also tried scheduled casual talks with the whole team, but didn't have more success than you.
I think the closest we get was the small talk before meetings start, but as we're starting to get auto-transcript for all our meetings that also became very bland.
At my work place we have a meeting on friday afternoon. It was initially a meeting dedicated to quick knowledge transfer or helping out a member of a team who needs help on a particular topic but is also used to chit chat a bit before wishing everyone a nice weekend. We don't do transcript nor recording of these.
We had watercooler meetings some at remote companies I worked at, but yeah they usually don't really work. One problem is that the stream always attenuates to one person (which is good in normal meetings to not pick up too much random background noise), but it completely kills spontaneity. Also, there are always people with horrendous mic quality or background noise.
As a result 1:1s tend to work much better technically for socializing, but it of course doesn't bring the group vibe.
The idea in the article sounds really nice! Unfortunately does not really scale to larger companies than maybe 5-10 people.
Venting privately is usually a symptom of bad management. Employees feel that they can't discuss any grievance publicly, for whatever reason, and so choose more careful means of communication
