Which country enjoys the Bhutan Visa-free policy in 2023?

Besides Indian citizens and those who travel to Bhutan with passports from Bangladesh and Maldives, some other people can enjoy the visa-free policy to Bhutan.

Those Officials carrying diplomatic, UN & official passports will be issued gratis visas, which are free of charge.
Those who receive a formal invitation to Bhutan from "a citizen of some standing" or a volunteer organization.
Those who come as guests of the Bhutanese government.
Thailand and Switzerland nationals holding diplomatic or official/service passport: a non-pre-applied visa with a maximum stay in Bhutan of 90 days will be stamped into their passports at entry.