> "Dollar (symbol: $) is the name of more than 20 currencies, including those of Australia, Brunei, Canada, Hong Kong, Jamaica, Liberia, Namibia, New Zealand, Singapore, Taiwan and the United States." - Wikipedia
When you talk about the price of pacemakers, penicillin or Wifi do you expect everyone to talk about them in AUD just because they were invented there?
Just because you (presumably) live the USA doesn’t mean the rest of the internet does.
On the other hand, Slack's walled garden is also effectively anti-competitive; trying to create a monopoly via vendor lock-in to the Slack product & ecosystem.
It feels like a better bet would be for both of them to adopt and support open interoperability standards, so users can avoid being locked into any single vendor, and have full sovereignty over their conversation data. (Disclaimer: as project lead for Matrix I may be biased :)