[xvector]

Good for you. Normal people do not want posts shared privately amongst friends to become publicly available.

[falcolas]

Then why would you ever put it on a website that generates its revenue from using and selling your data?

[nathanaldensr]

Because you're (not you, but people in general) are dumb and overly trusting.

[marlowe221]

This is the correct answer.

[blantonl]

Because you agreed to do so under the terms of conditions of that website.

[nlh]

Look I understand you point from a legal standpoint, but do you really truly believe even a small fraction of FB and IG users actually “agreed to do so under the terms and conditions of that website”? They just clicked whatever was necessary to create their accounts. I doubt there was much affirmative agreement going on there.

[Nextgrid]

There's no evidence the scraper companies mentioned there are making the scraped data public or sharing it with anyone beyond the individual customer that is already entitled to access that data through the official clients.

[orangecat]

Then you need to trust your friends, because copy/paste and screenshots exist.