It’s possible that these measures sought to boost recycling rates as well as to save money. In reality, it’d be difficult for anyone to say either way. Whether or not it’s a good idea is another thing entirely.
Collecting non-recyclable waste every three weeks would likely increase recycling rates at least somewhat – as residents would be more careful about disposing of recyclable items in black bins with less space. However, it’s difficult at this point to tell exactly how effective the measure would be.
Most reasonable people would probably be willing to go through a certain amount of inconvenience to increase recycling rates – particularly after awareness has skyrocketed this year. But it’s incumbent upon councils and governments everywhere to ensure this inconvenience has tangible effects and results – and that it’s more effective than other potential solutions.