I was really confused too so I had assumed it was related to something written in the article as I had just opened up the comments

Now that I know CTA means Call to action, its okay but lets be honest that they could have atleast said either CTA (call to action) or just skip the abbreviation itself since I assume a very significant proportion of people were confused so what's exactly the point of an abbreviation like CTA is certainly up to debate and people are definitely debating it so I am waiting for what the overall consensus on the whole thing is :)