it sounds like 'strings' may actually only refer to contract terms, not, say, a series of tripwires put in place with the goal of decreasing performance.
No Strings I believe refers to no contract.
However we don't have a series of "tripwires" with the goal to decrease speed. We have a system designed to prioritize "Attended Traffic" Eg: YouTube, general Browsing, gaming etc at the cost of decreasing some types of traffic like p2p.
Residential connections don't have dedicated speed associated with them its a shared connection thus the decrease in speed during high demand times.