Companies think that the data that is portable is your email address, profile picture, address, IP addresses - but other things like posts, comments are not. It

Companies think that the data that is portable is your email address, profile picture, address, IP addresses - but other things like posts, comments are not. It is actually not well defined in GDPR and if portability means transferring your profile (e.g. username, email and some details about you only), then GDPR is pretty much useless in that regard.