Churn is inevitable with any subscription service.
The trick is creating just enough value and exclusive content/services that you feel like you’re gonna miss out if you leave. But not too much.
I haven’t seen any incentive to stay with any specific game subscription service via exclusive content or services. But I do see plenty of attempts to lock people into services with shitty tactics. Like forcing save data to the cloud. Good luck moving that saved file to your own personal copy of the game. Or multiple tiered service options with features/games locked behind more expensive options.