they don't care because their _users_ don't care.
I find these discussions are always led by engineers, shaking their fists at clouds. nobody cares! it doesn't make any money so you're just whining into the void.
Except that's not true. Users do care they just don't have a choice in the matter. I have listened to many, many laypeople who have expressed frustration with software. They may not be able to articulate it to the extent that the quote does, but when they're stuck on 3G and they need to load a webpage that keeps timing out they get frustrated even if they don't know its because of the footprint, it's a poorly made SPA, or whatever.
I respectfully disagree. I think the users care, but they don't make their own choices - their choices are made for them by people who don't care!
Was MS Teams chosen by their end-users? Nope.
Come to think of it - was Slack chosen by their end-users? No, again.
End-user's aren't given an option, usually:
1. For B2B the choice rests with one (or a few) people.
2. For B2C the choice is made purely because some product got some traction for reasons unrelated to its quality, and that was enough to force the rest of the users to follow or be left out of the network (Slack, Facebook, major shopping sites, etc).
The majority of end-users did not exercise any choice.