Slacks annual revenue was 200 million in 2017, when they were a 5 billion dollar valued company. 200 mil is just 1000 Bay Area salaries, and they do have other budget items.

Its entirely possible that they cannot fund 5 native development teams, while building their core features to justify their valuation, and paying their sales and marketting team to actually generate revenue.

5 Devs on each team, which should be more than enough if they're getting 200k a year would cost a total of 5 mil. A tiny amount for such a huge improvement for users.

I legitimately can't tell if you are joking.

It does sound like a joke. It also ignores that fact that other, proper, multiplatform technologies exist that still produce a far superior end result for the user even if not 100% platform guidelines/conventions compliant.

What do you mean? Slack is valued at ~5 billion dollars, that has very little to do with their actual cash on hand. In 2016, they were bringing less than 65 million in revenue, for example.