Maybe I am misunderstanding what CTO.ai does. GitHub actions are for CI/CD pipelines. Where as CTO is a bot for interfacing with webhooks over chat. The broader term would be ChatOps. Something more comparable in the Github world would Hubot. Jesse Newland has some good lectures about why you would want to do this. Many of the examples come down to visibility of work in remote teams, and creating cleaner interfaces to useful products. There are a number of tools, many people use day to day because they are useful, that have terrible interfaces. You also see some organizations consolidating things like knowledge bases. Apologies if I have generalized CTO.ai in a way that is incorrect.

full disclosure: I work for CTO.ai. It is a similar concept really, but the Ops Platform has a built in interop layer for communicating between the containers & slack channels.