There no limitations in terms of the citizenship of the applicant. The ministry will conduct an investigation to check whether the applicant has any past criminal charges and about the funds that he/she is using for the investment to be sure that they are deriving from legal sources.
No, there are no restrictions based on the country of origin of the applicant for the investor visa program in Italy.
There are no restrictions related to the nationality and/or the country of residence of the applicant. The requirements are the same for all applicants, notwithstanding their country of origin.