To expand on this point a bit, Ars Technica has some articles on the copyright extension saga. In 2019, when works started going into the public domain again in the US, they published https://arstechnica.com/tech-policy/2019/01/a-whole-years-wo...; in 2018, they published https://arstechnica.com/tech-policy/2018/01/hollywood-says-i... which had interviews saying that there were no plans for another copyright extension term push.

Of course, both times, comments were pretty incredulous that Disney would prevent Steamboat Willie from going public domain. And now we're 3 weeks from that happening, and 1 week from the US House planning to go on recess, and there's no sign of any bill that would extend copyright further. People who pay attention will note that Disney has seemed to prepare for Steamboat Willie going public domain: part of the short now appears as part of their film logo in movies, presumably to enable them to claim it as trademark and sue anyone who tries to upload it into oblivion. Nevertheless, I fully expect quite a few people to do stuff like upload Steamboat Willie to Youtube in January, and it will be interesting to see what the response of that is.