are you aware how legislation works? you regulate a category as a whole, not randomly pick a specific company and write laws just for it.
if you regulate alphabet in particular, that would send everyone a message that this is now the "officially approved" provider. no others are regulated, after all! it would only increase the barrier to competition.
competition is a good thing. currently, thanks to email+DNS being open protocols, there are no barriers to operating e-mail for your own domain or providing it as a service. as a result, plenty of profitable providers (fastmail, aws) between which users can seamlessly switch.
if you regulate alphabet in particular, that would send everyone a message that this is now the "officially approved" provider. no others are regulated, after all! it would only increase the barrier to competition.
competition is a good thing. currently, thanks to email+DNS being open protocols, there are no barriers to operating e-mail for your own domain or providing it as a service. as a result, plenty of profitable providers (fastmail, aws) between which users can seamlessly switch.