It’s also because their current shows suck, and because any shows that are actually good get shitcanned after season 2, because Netflix sees less consumer growth after two seasons.
I'm always surprised at how often other people (not you) will defend this practice from Netflix. It's classic case of following the data in a stupid way. If their data shows that interest drops off after two seasons, I don't doubt it.
But... that comes with a cost. They have built a reputation as a company that doesn't properly finish shows that they start, that will leave viewers hanging. That makes it harder to get people invested in a new series, even one that's well reviewed. Why get interested in something you know will end on a cliffhanger?
That kind of secondary order impact from their decision isn't going to show up in data. Doesn't change that it happens all the same.