Comcast Converting 50,000 Houston Home Routers Into Public WiFi Hotspots
No it doesn't. This will use a separate SSID and external IP address from your home connection (as well a separate channel). While I don't agree with this practice, misstating how it works helps no one.
SIP Attacks From Amazon EC2 Going Unaddressed
I think you're overly optimistic about the performance of most routers...
Bell Canada Throttles Wholesalers Without Notice
Bell is not an upstream carrier in this case. This is a tariffed (government mandated) last mile service. The contracts and pricing are identical for all wholesale customers (with some minor variance for volume). Wholesalers purchase last mile service from Bell, which is then aggregated and backhauled to an interconnect with Bell (called an AHSSPI - Aggregated High Speed Service Provider Interface) and dumped on the respective wholesaler's network. The wholesaler is not necessarily purchasing Internet transit (which is a completely separate service) from Bell (your "upstream carrier"). This is being done at the CO-level, long before it hits the wholesaler's network and is not being done on their transit services.