I really wish that GDPR had gone a step further and imposed some requirements over the shape of the data that companies are required to expose. For domains like ecommerce, or banking, or social media, companies should be required to export their GDPR data in the same format as each other.

Bonus points if companies are also required to allow users to import data in those formats. That would make it easier to avoid being locked into a specific platform: export your data from the old one, import it into the new one.

Before you say that this is impractical -- Google requires that other companies submit data to it in very specific formats (eg, product listings), so I don't see why governments can't impose similar requirements on companies, too.

It probably wouldn't be applicable for companies with highly-specific data models, though.