I am old and used to use FB back when it was cool. Think 2010-14 period, and it was addictive even then even when it was just content from friends. Humans have deep need for connection with other humans and they will be addicted to anything that provides it given that modern society is increasingly isolated.

People are addicted to reddit, heck I know people who are addicted to Stocks app because they just need something to scroll.

Modern day addictions are complex and products are not the sole cause imo, they are just filling a void. Why that void exists needs to be answered. You remove Instagram and that time will be replaced by Reddit, tiktok or whatever product gives you some dopamine