Apples and oranges, that.
The USPS is run as a government service, not a private for-profit business. They keep mail delivery affordable as a service to residents. This is completely different than the government loaning and taking a stake in a for-profit business and then selling their stake ASAP. The government profited from the TARP bailout loans in 2008.
The USPS's situation is also rather unfair and not comparable to any other government agency. No other government agency has ever been forced to do this:
https://defazio.house.gov/media-center/press-releases/defazio-authored-bill-to-help-us-postal-service-maintain-sustainability
As it turns out, 2006 was the last year the Post Office broke even:
https://www.washingtonpost.com/business/2020/06/25/postal-service-packages-coronavirus/
It shouldn't come as a surprise they are now bankrupt.