Note that I didn't mention GDPR or any regulation. Data export is for me a feature that makes it easier to walk away from a service (and, as a side effect, makes it easier to use the service by performing the export periodically and keeping an indexed copy of that data in your favourite database). What Discord offers doesn't help me walk away from it at all, so from my POV it's missing this feature.

Do you know why Google Hangouts and FB Messenger provide a data export that includes others' messages? Do they base it on a different interpretation of the law, or is there some other reason for them to do so?