The rules for selling "Season Passes" on Steam have been clarified. Only one postponement of the DLC distribution is allowed, and strict guidelines such as suspension of distribution and refund measures have been added if it is postponed for more than 3 months.

The rules for selling "Season Passes" on Steam have been clarified. Only one postponement of the DLC distribution is allowed, and strict guidelines such as suspension of distribution and refund measures have been added if it is postponed for more than 3 months.
Valve has clarified the availability of Season Passes on Steam for developers who sell games on the store. The rules for selling "Season Passes" on Steam have been clarified. Only one postponement of the DLC distribution is allowed, and strict guidelines such as suspension of distribution and refund measures have been added if it is postponed for more than 3 months....

The linked article is in Japanese.