I would use this to replace my current NanoPC-T6 home server, as this lies freely within an ATX case in my 19inch rack ... the Rock5 ITX would definitely fit better into the case, and I could also use the plugs on the ATX header much better.
(The NanoPC-T6 will then be used for some other projects ... definitely some AI related stuff :D)
I would use the M7 to build an AI enhanced Cat Flap, which could distinguish my own cat from all the other ones in my neighborhood (especially the direct neighbor's cat won't stop sneaking in at night and bringing chaos to our kitchen )