The executive order[1] targets the Government of Venezuela [2] not all Venezuelan companies and individuals. But I guess it's easier to deactivate everyone than try and verify if the account is related to the Government of Venezuela.
[1]https://www.treasury.gov/resource-center/sanctions/Programs/... [2] the term ‘‘Government of Venezuela’’ includes the state and Government of Venezuela, any political subdivision, agency, or instrumentality thereof, including the Central Bank of Venezuela and Petroleos de Venezuela, S.A. (PdVSA), any person owned or controlled, directly or indirectly, by the foregoing, and any person who has acted or purported to act directly or indirectly for or on behalf of, any of the foregoing, including as a member of the Maduro regime. For the purposes of section 2 of this order, the term ‘‘Government of Venezuela’