Those all predate 2017:

- Slack: 2013

- Zoom: 2011

- TikTok: 2016

Based on "Initial Release" on Wikipedia.

Neither slack nor zoom did anything new or interesting. Just a clone of stable tech that worked out in marketing

Maybe they didn't have innovative functionality initially but the user experience was certainly better.

Microsoft fumbled Skype and nobody was putting together convenient apis on top of IRC...

Right, so iterations that ate up the old-school competition, not revolutions

What was the last major tech company that was a revolution and not mere iteration?

Maybe Netflix?

That’s a good one. Which suggests Amazon as well; similar revolution in distribution and scale.

But there were companies shipping DVDs before Netflix, and also companies streaming movies online before them. So really a marketing / operations / distribution revolution.

Netflix and Amazon were the first to effectively scale their revolutions up to mainstream accessibility that made them clearly superior to the competition. You could say they brought already-simmering revolutions to boil.

Google was initially revolutionary just because their search engine actually worked incredibly well back before people started trying to game their rankings

Slack was skype

Absolutely not.

Skype figured out how to build an integrated login experience. Every morning using slack I keep having to remind myself it’s not early FOSS!