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Apparently Instagram is adding a data export feature for GDPR-compliance... So if you're building an Instagram-esque ActivityPub platform, there might be some value in adding an import function 
@Gargron Provided that the exports aren't just HTML pages with no parseable elements.
@deadsuperhero @Gargron I once wrote a parser for Facebook's export format, because some guy on a channel (he isn't there anymore, sadly) wanted to import it into WordPress; the scraping wasn't that hard, actually