With USPS, it's because Trump keeps attacking it. He still blames it for his loss to Biden. And by extension, many in his party are doing their best to defund it. The postmaster Trump put in charge a number of years ago is also doing his best to dismantle things.

But the private carriers have no excuse. I suppose there has been increased usage since Covid, but they should then start hiring more people instead of giving the CEO another raise.