Earlier quoted context omitted.
You'll probably catch a lot of flak for that on HN, but I 100% agree with you. Just because something is public and can be saved for later doesn't mean it should be done so en-masse. These are social spaces where a lot of young people essentially grew up. An important part of social development is making mistakes and learning from them. How can you make mistakes when those mistakes are archived for all time for every…
There is no expectation that anything said on social media will remain private - zero - and anyone that thinks differently is just lying to themselves and everyone else.
Bluesky had a similar freakout when HuggingFace packaged up a snapshot of the firehose and this discussion was had ad infinitum - in Bluesky's face every post is explicitly public -- but a very vocal minority of users still felt they had been wronged because no one asked if they were OK with being a part of a research project. There's definitely a gap between what users /should/ be aware of and what impression they actually get using a service, and you have to keep in mind most people are not techies that have spent years of their life wrestling with issues of privacy and data ownership, so announcements like this can come as a surprise, the first time they considered that what they said in one context can be moved to another.