So, I can build products that aren't big enough to interest Google, but include a bunch of tech developed by Google (and others) and leverages their APIs to provide a unique service that is feasible for me to build, and will be useful to a wide variety of people. I can offer it for very little money (one person's side project), and hopefully have some fun learning about deep learning.
I'm so new to it that I'm not even thinking about advancing the state of the art or doing novel work. But, in a couple of years, who knows. Just tinkering with things in a new industry often provides pathways to cool stuff because so many doors are opening all the time. This is like being involved in the Internet in the early-to-mid 90s. You probably won't become the next Google, but the odds of finding a highly profitable smaller niche seems pretty high.
Also, there's going to be a ton of acquisitions in the AI/deep learning space over the next decade. Every company that even does a little tech will "need" an AI story to keep their investors happy. Your tiny thing could be one of those acqui-hires, or maybe not.
Then again, if you have an interest in other stuff, and really don't feel excited about it...probably not worth forcing yourself to get into it. Life is short, you should do stuff that's fun, even if you have to ring the cash register now and then.