Within this context it's specifically people in the ISP and telecom business, most of whom have been in the business 15, 20 or 25 years now. Some of us started out as junior NOC techs, junior sysadmin/Linux/BSD guys in the late 1990s at different dotcom 1.0 startups.

At a certain scale you know who the people are that have super-admin privileges at very specific ASNs and they are well known in the industry. Basically much as somebody in academia in a journalism school on the west coast would know who is the department head of the school of journalism at a major university in Boston or NY and recognize their name.

Now within a Signal group of 150 people adjacent to the neteng teams at large to medium sized US/Canadian ISPs, it's entirely possible that somebody let an uninvited rando in, but we don't discuss anything super sensitive (that's for more 1:1 messages). A person who has been lurking for weeks or months and suddenly starts chatting in an inauthentic way would be found out very quickly.

One of the things that ISP technical operations groups do very well is filter for non-authentic participant in something, because sales persons getting into groups of technical discussion with the angle of selling some new thing is a perpetual problem and is a well known factor to deal with.

Also sales people generally don't do well when a complex operational-related technical matter is put in front of them in a fast paced environment where they can't engage their engineering team to get an accurate reply. Ask anyone that's ever tried to get their direct cellphone number removed from a Cogent IP transit sales person's CRM system....

Yes, I got that, but what I actually mean is that these criteria do not necessarily lead to good conversations.

I know the kind of space you are referring to. I'm in those too. But my point is that they regularly disappoint me.

Which is usually worse disappointment than with randoms on the internet, because the people should know better but don't.

With these tight knit spaces you get all the social dysfunctions of people liking each other not for merit but because they've been around each other for long, and that's - for me personally - worse than the public alternative, as you suddenly do not argue with logic, but with the tribe and social cohesion.