Now the real question probably is, "how do I stop this?". The simple answer, you can't. Additionally, you can probably expect to see a lot more advertisements and promotions sneak their way over to your Instagram feed in the coming time.
The positive side of this for consumers is that they can expect to see a wider range of customized advertising. Although many may find ads tailored to them as repetitive or annoying, think of it this way: Would you rather have an ad customized to something you are slightly interested in, or would you rather have random ads thrown on your feeds? The truth is customized advertisements do a lot for us. They reestablish our interests, ideas, and overall reflect our personalities.
We can't stop these ad's, but with new and innovating products and services constantly hitting the market, wouldn't it be the easer and most effective way to learn about them is by sneaking one every once in a while into our rapidly updating feed? I say, show me ad's that will be tailored to my interests, just please don't overdo it.