People in the real world use instagram and whatsapp all the time without any moral qualms. The main reason facebook as a product is on a decline is because it is simply not interesting to younger people anymore. And even then, FB still manages to occasionally produce features that capture a lot of the audience back. FB marketplace has been a great hit in terms of replacing craigslist.
I am not a Meta employee, and have never been one. But the hate hard-on some people on HN have against Meta just gets really ridiculous at times. We decry echochambers on social media all the time, but are perfectably comfortable falling into ones of our own, without trying to understand how the world outside is really like.