It's only a short-time gain though. With a shared account between 4 households, chances that one of them is actively using the service is much higher than with only 2 users. If a service is used less and less, chances are increasing it's going to get canceled (especially now that prices are soaring while wages are not increasing accordingly).

That's my experience as well.

Do you mean they increased their revenue overall? Despite losing 2 households of viewers because of the increase in individuals paying for it outside of your 4 households?

Because you said 2 households dropped out and the other 2 paid more each. But that would still total to the same amount of money to netflix but a lower viewership, which affects their engagement stats and might get more netflix originals cancelled or other shows dropped.