If you're from Iran you can't even get a visitor visa now: https://en.wikipedia....

xaranke on Aug 17, 2018 | parent | context | favorite | on: Traveling the World on a Third World Passport

If you're from Iran you can't even get a visitor visa now: https://en.wikipedia.org/wiki/Visa_policy_of_the_United_Stat....

Also waiting for a visa for 2 weeks means that your passport is tied up for those two weeks and you're unable to leave the country you're in. This could put a serious dent in the plans of any digital nomad.