All of the following are grounds for denial of licensure except?

Being a Maryland resident is not typically a requirement for obtaining a home improvement salesperson license in the state. While many professional licenses require residency for various reasons, such as understanding local laws and conditions, the rules governing Maryland home improvement licensing do not explicitly necessitate that applicants be residents of Maryland.

In contrast, having a criminal record, a previous license revocation, or a history of fraudulent practices can raise serious concerns about an applicant's trustworthiness and reliability. These factors are often considered detrimental to the integrity of the profession and can ultimately result in the denial of licensure. Thus, the absence of a residency requirement stands out as a significant reason why the correct answer is that not being a Maryland resident is not grounds for denial of licensure.