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Microsoft: solve our visual CAPTCHA if you want to submit a GDPR request
(www.microsoft.com)
Everything related to the #GDPR is discussed here. This is the first and only community specifically for GDPR topics which is decentralized and outside of walled-gardens. #EDPB recommendations and guidance can and should also be discussed here.
For the moment, chatter on the similar California Consumer Privacy Act (CCPA) could be discussed at least until the volume of messages compels us to split it into a separate community.
I think you are allowed to send an email (or even real mail!) to any address publicly associated with the company and they are required to handle it appropriately. Means, you can get the address from the impressum/about page (which they are also legally required to have) and send it there.
Every method has a barrier:
A webform could potentially have the fewest barriers, but they blew it.