That was not always going to be the case. However, Google responded to the "avid feedback" among users, according to IFTTT, and created a path for current Nest users to keep their applets functioning, including IFTTT.
"At IFTTT, we believe that every thing works better together and we will continue to advocate for your ownership over how the products, apps, and services that fill your life can be connected, secured, and controlled," IFTTT said.
Naturally, Google "strongly recommends" migrating over, though the step is entirely optional. From Google's vantage point, the Works with Nest program is outdated, as the connected home has evolved since the program was created in 2014.
"Moving forward, our team will focus on delivering a single consumer and developer experience through the Works with Google Assistant program—a one-stop shop to enable rich cross-product integrations and build a more helpful home. Google Assistant works with over 3,500 home automation brands and more than 30,000 devices, providing key benefits," Google says.