I might be wrong, but I don’t think that this is allowed under GDPR. They have to offer to you the same services with or without the consent to collect your dat

I might be wrong, but I don’t think that this is allowed under GDPR. They have to offer to you the same services with or without the consent to collect your data. Also, under GDPR, you can always request export and removal of all your profile data from their data stores.