So if you block your Netflix payments you really think there going to send debt collectors? No, they'd lose more money on hiring a collector than they'd gain back from recovering one month's subscription.
They probably could and I'm assuming they would just sell it to a collections agency for pennies on the dollar and the collections agency would just send an automated notice hoping the person would pay it. For example, I had wave internet in seattle and when I moved I obviously canceled. They screwed up setting the cancellation date though and ended up charging me the next month. Just got a collections notice for that 1 month of charges. I messaged them and apparently there is nothing they can do from their end at this point so now I'm disputing it with the collections agency.
Pretty dumb on their part if you ask me considering now I'm telling everyone not to use them because of their screwup and the fact that they would sell it to a collections agency over 1 months worth of payments.
Like the other person said, here you have to explicitly end your subscriptions. Stopping payments will not end your subscriptions. You'll end up dealing with collection agencies.
Unless the company values their public image and return customers more than a small payment, which thankfully is the case for many. I just wouldn't count on it, ever.