Instagram has an algorithm placed to control and over the activities on the platform on the platform Instagram algorithm decide which posts, reels, or videos are on your feed or discover page based on your likes and dislikes. Some people try to grow their followers very fast by following and unfollowing lots of users and excessively commenting on different posts in a short period These actions abuse the Instagram system in other words to protect the app and its community Instagram finds blocks accounts that are involved in spammy behavior
Instagram blocks users engaging in spam activities for a particular period and shows them Instagram action blocked error messages. https://socinator.com/how-to/instagram-action-blocked-best-7-tips/