Instagram employs various techniques to prevent spam and block new accounts that may engage in spammy behavior.
Captcha Verification: When creating a new account, Instagram may require the user to complete a Captcha verification process. This involves solving a visual or audio puzzle that proves the user is a human and not an automated script.
IP Address Checking: Instagram can track the IP address of the device used to create the new account. If the IP address is associated with a history of spammy behavior, Instagram may block the account.
Phone Number Verification: Instagram may ask new users to verify their phone number by sending a code that the user must enter to complete the registration process. This helps prevent the creation of fake accounts.
Image Recognition: Instagram uses image recognition technology to identify potentially spammy content. For example, if a new account uploads multiple similar images in a short amount of time, it may trigger a spam filter.
Machine Learning: Instagram uses machine learning algorithms to detect and prevent spammy behavior. These algorithms analyze user behavior, such as the number of accounts followed or the frequency of posts, to identify accounts that may be engaging in spammy behavior.
Also take into account finger prints