That's a good example actually. Instagram/FB don't let third parties have access to your posts more than you allow publicly, and don't let you use automated too

That's a good example actually. Instagram/FB don't let third parties have access to your posts more than you allow publicly, and don't let you use automated tools to scrape them. If you wanted to glean anything from those posts you need to buy the anonymized data from Facebook. The only way to balance the desire of users to make some data public and prevent anyone from grabbing all of it forever is to ban people from using automated tools.