The cryptocurrency rout has spread to startups that offer users digital tokens, pushing down digital asset prices and driving away hordes of users. The startups—part of what has been called Web3—allowed users to play virtual games and collect digital assets, and the companies’ growth was hinged on interest from people eager to wade into blockchain-based assets. The broader cryptocurrency downturn this year is causing a downturn in users in many Web3 companies, and players and investors are re-evaluating the utility of token-based business models.