Re: Commercial
Residential customers are an extremely valuable target - there's so many of them with designed-insecure routers, that oodles of bandwidth and processing power is available.
Many botnets use residential routers to offer unprecedented amounts of DDoS bandwidth and endless piles of residential IPv4 addresses for proxy use.
Due to modern bloat, modern routers have plenty of processing power - even when a router is being used as part of a massive DDoS attack, the only thing the resident could notice is a slight slowdown that goes away in a few hours - thus the resident never cares to do something about it.
Most businesses don't have racks of computers - many businesses now have no servers, or only one server that is overloaded with windows bloat and therefore is of similar use to a router.
The internet upload of businesses may be a bit higher, but utilizing it is risky - the business often has an expensive "IT consultant" that has little interest at being competent at their job, but is extremely paranoid and will throw a fit if the upload utilization ever remains on average above 0.5% - thus there's a high chance utilizing business connections for DDoS or for significant proxy use would be discovered.
A pre-release of the newest blockbuster is of little value, as you'd be hard pressed to find many that are willing to pay money for such slop.
For businesses that only have other businesses as their customers, the business data is of little value - although such businesses can be useful to carry on social engineering until a business with valuable data is found.
A common attack now is to hijack business outlook emails by socially engineering the login details (very easy as the stupid microsoft account often needs to be logged into 3 times a day) and then send emails with a phishing link to all of the business customers and keep going.
The US technique seems to be to ban all routers and then follow up by mandating that only designed to be even more insecure routers can be sold.