Informally, walking through anybody's house, I can find dozens of linux devices. They're just white label. Your digital thermostat? Linux. Washing machine? Linux. Wi-Fi access point? Linux. ISP issued CPE? Linux. Switch? Linux
Audio mixing board? Linux ...
Intel management engine.. minux, so basically Linux.
I think you overestimate the money companies are willing to spend on memory and CPU for white line appliances. I actually have friends who have worked in R&D in the industry, cheap bastards wouldn’t splurge for an AmpOp if a BJT could do the job. If something required brains, a cheap small SoC was the way to go, with all its 64-256KB of memory.