One reason would be the abject failure of Chase/Expedia Travel to obtain and process refunds due to the pandemic (link below). This is not unique to Chase, nor even to Expedia, but for many people the amount of effort required to obtain refunds offset any monetary benefit to using these services. All of the dominant Online Travel Agencies (OTA) are owned by Expedia or Priceline. and the lack of competition means there is little likelihood they will invest in better systems. It's easier to throw people a 5% discount, which is probably less because they can pad the price of some services.

Chase Travel REFUND questions and experiences [Consolidated]