There are lots of benefits for sure, but you have to weigh them against the users who can't be arsed to cancel their subscription and keep on paying. You'll miss out on those.
That is what this effort is aimed at: sleezy status quo
I think this is maybe a bit simplistic. People forgetting to cancel means the price can be lower per-person. It's a little bit like how insurance is priced.
_Can_ is doing some heavy lifting. I mean, I'm not in the boardroom, but when was the last time a subscription got cheaper?