I don't even know if it's 'churning' yet until I've cancelled and gotten the bonus again in a few years.
But I had the 60k miles post to my united account and it felt like magic! Almost done with the spend on a second chase card and working to get my fiance his united card. It's been a frustrating application process because they made him go through some Identity checking procedures and he's been not very excited about the whole thing unlike me.
Early tip about chase cards, you can fund bank accounts with them. Often there will be an associated bank account bonus too. I love closing out a chase card completely with couch MS.