Teamspeak and those tools currently have cross-channel communication which is very useful for large squad games. They are definitely a minority as most games are like 5 players per team.

So they have their niche uses (mumble too). guilded.gg is trying to fix that issue.

Having said all that, TS is definitely not a freemium business model. And they did well for themselves. But they are certainly stuck in their old ways.

Craigslist had many attempts to modernize. Turns out... people like the minimalistic nature of it. There are like a billion competitors, and they all failed.