Loadstar on 21st May reported that the UPS appeal to force the US Postal Service (USPS) to raise its parcel-delivery prices has been rejected by the US Supreme Court, which means the government can continue determining how much to charge for parcels. The article says that it seems the big winner is Amazon, which heavily uses USPS for deliveries.
https://theloadstar.com/supreme-court-rejects-ups-appeal-on-usps-delivery-prices/