Like, I can come up with plenty of possible reasons, and reasons why it could potentially be very bad if ISPs started cracking down on this, but I don't actually know any reasons.
Are any talking about why / why not? It seems like this whole insecure-IoT-device thing would probably dry up pretty quickly if people's internet was cut off when one was detected. They can then turn around and lambast / sue / etc the company that sold it, putting pressure on the source of the problem. Right now there's no reason for sellers to do anything at all to ensure security, afaict.
So... not actually arguing in favor of it, but definitely curious about any stated ISP / core networking system's stated reasons.
The problem is there's no real alternative.
Your grandma is not going to use Linux. So the choice is between windows and mac.. and the truth is a lot of apps people use are windows only.
I don't see windows losing desktop share anytime soon.
I also brought a 85mm prime which has been a lot of fun, while at the same time I've been lugging around a 35mm prime and barely used it.
The author lost me when they got into raw iproute commands. Not because I'm not acquainted (I run my own custom complex router using a standard Linux distro). But rather if someone knows enough to configure things at this level, then they would just come to this solution on their own. Most people trying to solve this problem will not - eg think that mobile video rack belonging to a touring musician.
Readily-accessible solutions I can come up with off the top of my head:
1. Two off the shelf routers and double NAT. The middle network can be changed if it conflicts with the outer network
2. One router/NAT, but two IP networks on the inner network - one statically assigned for devices to communicate with each other, and one assigned via DHCP for accessing the horizon through NAT. That second network can then easily be changed.
3. Play battleship more strategically using class E address space, DOD/BigCo address space, and/or smaller subnets in the middle of the customary size for a range (eg 192.168.1.160/27).
There's also a lot of people that configure these devices (or linux routers) themselves but have never heard of VRFs, you got to learn about them somewhere so I just hope this helps some people :)
I have a bunch of camp badges there too and while some are really fun boards to play with I wouldn't trade safety for longer battery life with any of them.
Two 18650s also sounds like it would be heavy for a badge
Luckily it's usually a tmpfs