As the article states: because of inertia. They had things in place, there were some shortcomings but it was free so there was no reason to be too bothered, and

As the article states: because of inertia. They had things in place, there were some shortcomings but it was free so there was no reason to be too bothered, and there was no reason to really switch away from IFTTT. Now they have that reason, and so they wrote this article.