The WhatsApp sale also happened back in 2014. I don't think FB was especially well liked at that time, but they didn't have as bad a reputation as they do now. 7-8 years is a long time.
I remember WhatsApp touting the fact that they charge a $1/year subscription to be evidence that they will not sell out data about your use of the app and your contacts, presumably as a contrast to the chat apps offered by Facebook, Google, Microsoft, and others wanting to sling ads.
Obviously, the offer from FB was worth selling out for.
Obviously, the offer from FB was worth selling out for.