First of all, these accounts may be registered by stealing other people's identity information, which is illegal. Once discovered by Google, these accounts will be banned and the accounts you purchased will not be available.
Secondly, the quality of these accounts cannot be guaranteed. There may be various problems in the purchased Google account, such as the account being banned, the account being occupied by others, and the account information being untrue. These questions will affect your application. It will waste your time and money if your application is rejected because of the account number problem.
Finally, buying a Google account may bring legal risks. Some sellers will provide illegal accounts, such as accounts registered by stealing other people's identity information, which are illegal. If you buy these accounts, it may involve legal issues and bring you unnecessary trouble.
Therefore, it is recommended that you register your Google account legally to ensure the quality and security of your account.