The idea that there is “a” WhatsApp group is a red herring.
There will be many WhatsApp, telegram, Reddit, etc groups. The majority will be small. I’m in a bunch of groups discussing SBs, but they have limited usefulness and a tendency to fizzle out.
The majority of SBs will not be on groups at all, but the more pro they are the more likely they are to be sharing intel.
Best approach is to not give it a second thought.