Typically, these sites ask you to log in with your Instagram credentials to "send" followers to your account. The Appeal of "Free and Exclusive"

Hook viewers in the first 3 seconds with a visual or text prompt. Keep captions concise but packed with searchable keywords. 2. Optimize for Instagram Search (SEO)

Some guides also suggest using a VPN, as the site may track your IP address and limit how many times you can use the service.