Apparently because they're innovating with Thor, according to[0] Daala people are experimenting with Thor tech (IETF 93 was a few weeks ago) and Daala tech is being experimented for Thor[1]

[0] https://www.ietf.org/proceedings/93/slides/slides-93-netvc-5...

[1] https://github.com/cisco/thor/pull/8