I think that is a pretty normal OSS situation though; there's a fairly small overlap between who care enough to play in the arms race for Tiktok videos and people who want to spend their time updating youtube-dl. Other sites were regularly updated, so it's just down to what individual maintainers have time and inclination for. Tiktok are pretty active in that arms race, I can only suppose most maintainers feel it's not worth a constant battle for Tiktok content.