No United Features comic publisher books on DCM, but on Comic Book +? Why?

[bminor]

So I was curious,
No United Features books here on DCM but many, many on CB+??!!!

[Yoc]

United was designated unsafe for DCM back when the staff was part of the GAC site.  Before I was added as a staffer.
Many titles feature characters that are not in the public domain.  Instead of sharing incomplete books like we are doing with some Dell and Harvey books we decided to not share any at all.

-Yoc

[bminor]

So I found out a bit more about Sparkman and United Features publisher. They did not do a whole lot of books. But some of them were reprinted in 1945-46. Sparkler Comics(62 pages) 1 (with Sparkman) became Sparkman Comics 1(36 pages), (with almost an identical cover)
Interesting!!!

[bminor]

Does anyone have Sparkman 1? They look all PD to me.