The fact that instagram is relatively recent doesn't matter here, what matters is the social norms. You're a social outcast if you don't use ad-ridden software.
I'm not willing to be a depressed loner with no friends in order to avoid ads, if that's what you're asking. Just because I can unalive and no longer see ads doesn't mean that I have to like seeing them.
Social norms have changed, and I can't fix that by myself. I'll happily argue that social norms being ad-funded and brainwashing the populace, myself included, is bad though.
> Does your landlord or phone company have a website?
The cell phone provider's website has just as many ads as the app, they're equivalent. There isn't a webpage for my landlord.
You're not willing to make literally the smallest of sacrifice to get what you want in avoiding ads. You've chosen a discount mobile network, go with a premium one to avoid ads.
If you're not going to be willing to pay for these things today how will your life be when you're forced to because they are no longer subsidised by advertising?