A lot of here are very open in quoting Instagram Ads as a No Result campaigns to increase followers and A Waste of Money and Time. Well, Buying followers majorities are from bots, these are inactive accounts that's intended to disappear in no time, but some followers can stay there as your account follower/s. I suggest, if you wanna have stable followers, you can just purchase from sellers who are offering IG real followers or they have extra services such as manually following or unfollowing your accounts strategy.