It seems like Vivaldi has chosen the “safe route”, prioritizing their own resources by blocking potential spam accounts which often use anonymous email. Though one of the primary motivations for forcing PII, which I think is often the silent truth, could be to get you into a data identification pipeline, linking certain data points to you. Pretty unfortunate that you now have to trust Vivaldi here with your information to use this service while simply allowing anonymous emails would have given you a no-trust-needed solution.
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