Is there any information on them being given a pass?
Generally stuff like this goes in waves. I have no experience with the unity store, but it wouldn't shock me to find out they haven't always (and still might not...) required "apps" to list their licensing. Meaning this would be a somewhat manual effort done by a severely reduced staff.
And I'll just add on that I expect this to happen to the other "asset" stores. In industry, "GPL is cancer" and "LGPL is herpes". GPL can straight up "kill" a project and LGPL is usually a mass of headaches that are mostly manageable but can still "cause problems" at times.