Yep. ABC is less digitized and hides most full broadcast programs from the public (gotta be an employee for that). But https://www.abcnewsvsource.com/ is the Silverlight run site with everything. Someone should probably archive everything incase the Silverlight shutdown this year kills the site. Ripping it is mildly easy.

PBS/WGBH stores everything at https://americanarchive.org/ which for copyright reasons, some stuff can only be viewed at the LOC or WGBH. The physical only content includes a number of interesting items though like the few Mr. Rogers episodes not aired on Twitch, or around 2000 non-public but aired Sesame Street episodes.