More than that - a number of services (for example B2B SaaS) depend on knowing the email identity of their user. Are you John Jones <john.jones@goldmansachs.com

More than that - a number of services (for example B2B SaaS) depend on knowing the email identity of their user. Are you John Jones <john.jones@goldmansachs.com>? Of course you are, you signed up with that email address and the system accepted you. If a system like, say, Woobius, doesn't confirm emails, people will abuse this lack of feature.