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Major meaning that they're recognisable brand names and used by many companies/individuals perhaps?

Slack, Skype, WhatsApp, Telegram, Discord. You've definitely heard of at least one of them.

Major makes sense to me. All, less so.

Yikes, populism.

What GP is describing is not populism.

I don't particularly care whether I am right. It is what it is. The point was understood.