Epic Games Store will welcome games that make use of blockchain tech provided they follow the relevant laws, disclose their terms, and are age-rated by an appropriate group. Though Epic's not using crypto in our games, we welcome innovation in the areas of technology and finance.
As a technology, the blockchain is just a distributed transactional database with a decentralized business model that incentivize investment in hardware to expand the database's capacity. This has utility whether or not a particular use of it succeeds or fails.