[acdha]

They appear to be focused on an automatic version:

> Behind the scenes, R2 automatically and intelligently manages the tiering of data to drive both performance at peak load and low-cost for infrequently requested objects. We’ve gotten rid of complex, manual tiering policies in favor of what developers have always wanted out of object storage: limitless scale at the lowest possible cost.

[Heliosmaster]

GP isn't mentioning lifecycle to change storage tier, but to delete the files after some time.

[acdha]

You're quite right — I think I was primed by a different mention of S3's intelligent tiering in this thread.