Badoon's story got stripped away from Guardians of the Galaxy film (2014) and Wikipedia say’s Badoon film rights belonged to 20th Century Fox. But how, as per my knowledge Kree more belongs to Fantastic four but it still appeared in Disney properties, similarly in Quicksilver's case. But why only fox have Badoon’s rights?
But the reason why Marvel doesn't own the film rights to some of their properties goes back to the 90s.
In 1996 Marvel filed for bankruptcy.
In 1999 Peter Cuneo became CEO.
"Coming out of bankruptcy, Marvel was burdened with $250 million in high-yield debt... We adopted a licensing model for all forms of media, such as movies and television shows, and for consumer products such as clothing and school supplies....
Film is unparalleled in its ability to generate worldwide excitement for a fantasy property. Our strategy was to spread out our intellectual property among a variety of Hollywood studios, so that we could attract the most enthusiastic partners for each character. One or two film studios could never produce all the films we wanted, and we didn’t like the idea of being tied down to any single partner for all our films.
According to Kevin Feige (current president of 'Marvel Studios'):
"...the contracts are very specific... it's a little complicated..."
"I think [the rights] are shared. I think they are non-exclusive... I think [FOX] has Super-Skrull, I think it gets pretty detailed and pretty specific who has what.
"Marvel only partially owns Skrulls, and also for the record, we don't own the Badoon either..."