Why wouldn’t this be an opt in feature per-organization? I’m acme co, I buy a zoom subscription for acme.com, I click a box saying “let everyone with an acme.com email address see each other”. Done. Yes, I would have to prove I own acme.com, but we have solutions for that (didn’t set out to make this joke but, the ACME protocol, for one.)

Why is it that it’s on by default for arbitrary domains (excepting the ones some poor soul has to blacklist)?