An end user wants to pay a steady monthly fee for internet that never goes down. A property owner wants to get a steady monthly check for leasing a site. A technician wants to get a steady salary for fixing nodes.
A decentralized repair network is likely to reduce reliability for end users, predictability for property owners, and job security for technicians. All three of these parties may find it more optimal to have an ISP business which can finance and coordinate things, even if the business is taking profit which could have gone to the other participants.
You'd just need one crooked technician who can recruit some number of node owners. (If the tech did it via remote-controlled power interruption and only did it on scattered nodes in areas with lots of redundancy, they wouldn't even need to recruit node owners and split the cash. But they'd also be leaving evidence that could easily get them in trouble once someone started getting wise to it.)