Obamacare (ACA) "subsidies" were supposed to be temporary in nature and were pushed through in response to COVID, which became the go-to rationale used by Democrats to justify every aspect of their insane spending plans. Democrats themselves set the date for their Expiration and now they're disclaiming any sort of responsibility for the end of those purely temporary "subsidies" (bribes to their voter base, really) and they're willing to shut things down to continue to appease that base.