Is Instagram as profitable as Facebook and Twitter?

I'm someone who is very much used to marketing on Facebook mostly. I own some large Facebook pages and a large Twitter page but have never bothered to try Instagram marketing. The main reason being that my primary method of profit was by posting links to articles and getting paid per click. Instagram only allows links through the bio, unless you pay for ads.

They are all as profitable as eachother. You could never saturate the traffic

You can watermark images and videos with your homepage url. This will help in branding. If people start searching for your brand on Google, it'll give a boost to your overall SERP rankings.

AFAIK there is no method in instagram for direct conversions.