I actually think the hyperlink on Instagram thing is a conscious decision to limit people doing stuff like just posting news articles, and is a critical part of what makes Instagram feel very different than other platforms, in the same way people sometimes claim Twitter's decisions on short content affects its community (for better or worse). Like, I 100% agree with your point of companies limiting interoperability, but just not that example (and actually maybe also don't agree it has to do with smart phones: I bet a lot of this walled garden BS would also happen if everyone stayed on the web, and I feel was in fact already happening before apps became a thing).