There’s billions of dollars in monitoring and maintaining remote sites / handling remote connectivity, doing bespoke SaaS tools, etc. Like, literally high hundreds of millions or low billions.
To the extent that they're not actually wrong about that TAM:
https://en.wikipedia.org/wiki/Total_addressable_market#/medi...
Note that I am not claiming they'll get sales anywhere near to close to the TAM. It's not like Wikipedia's market value is even close to {peak price of Encyclopedia Britannica} * {number of people on the internet} even despite it no longer being generally contested which of Wikipedia and Britannica is now better.