My fuck-you-right-back response is I don't sign up and give up using the app. I had an instagram account and deleted it years ago. I don't want a new one. Sadly instagram is sign up only, so good luck to them and good bye.
Yup, this is how I respond too. While occasionally it leads to missing content I used to enjoy (miss u, /r/dogelore), for the most part I wind up never noticing the absence and having more time in my day. Win win!
I think it was Carl Newport who wrote that you should only use social media for your intended purposes and that you should use what technology (I think he said tool) is most effective for your particular needs.
The above is obviously my words and not from a direct quote, but I am using that strategy - for me Facebook is great for finding things that happens around here and so I visit it for a few minutes a couple times a week. Sadly most of my friends are on messenger, so I have that installed on my phone.
I haven't seen a need for Instagram, so I don't use it. I used to use it as a strictly photo posting place, but I stopped that hobby.