News for hackers. Stuff that matters.
Re:Slack have blocked using the website on mobile by Nextgrid on Saturday December 28, 2019 @12:58PM (#21900443)
It got acquired for the trust people put in the brand, not the technology or the employees. Facebook needed a backdoor into people's contact lists and WhatsApp had a huge user base of people who authorised it to access contacts.
Re:Slack have blocked using the website on mobile by jpalomaki on Saturday December 28, 2019 @02:52PM (#21901274)
More boring explanation: For most people Facebook is just a platform for connecting with other people. Any messaging platform with significant amount of users is a threat for them.

A platform like WhatsApp could evolve to cover the main things people are using Facebook for. History has shown that people are not too stuck on any platform.