Me administering a Zoom account for my fellow employees and my students does not erode anybodies right. For me it is a choice between a GDPR compliant vendor and a vendor that does not care about the GDPR. Personally I have had good experiences with the GDPR (Facebook finally having to delete my account even though I would not verify it with a personal ID and cell phone number after I went through the irish data protection authority) and Zoom claims to be GDPR compliant.
So, frankly I'm not sure what you are talking about. It seems like you are going for a slippery slope argument I don't agree with.