Stablecoins make a lot of sense in countries like Argentina where the national currency is a shitcoin. But YC doesn't fund startups in Argentina. Stablecoins can also be used to pay remote employees but that should probably go through an employer of record so that people aren't paid under the table. This sounds like more crypto for the sake of crypto.
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On face I don't see why startups would oppose to paying people under the table unless they just have a dogmatic adherence to the law. Like anything, they are likely to do a cost/risk analysis, which could change wildly depending on the context of the remote employee.