Why is "Underwriting spot" trending?

Wikipedia Overview

An underwriting spot, also known as sponsor credit is an announcement made on public broadcasting outlets, especially in the United States, in exchange for funding. These spots usually mention the name of the sponsor, and can resemble traditional television advertisements in commercial broadcasting to a limited extent; however, under the terms of a public broadcaster's license from the Federal Communications Commission, such spots are prohibited from being promotional or making any sort of "call to action". In the U.S., these restrictions apply to any television or radio station licensed as a non-commercial educational (NCE) stations, and even for non-sponsoring companies and products. However, this is not the case in Japan, as these spots can be played on both public and private broadcasters and are typically played alongside traditional commercials and appear after a show's opening theme or after a preview of a next episode or appear during a scene of a show.