Obviously this recurring motifs of the various Rich Assholes of Fionnaworld hiring the Cosmic Refugees as security plays well with the Theme of the overwhelming mundanity of Fionnaworld and how the biggest problems for Fionna and Friends still hinge on stuff like Relationship Problems and Capitalism.
Having money is still the biggest signifier of Power in Fionnaworld. And even when there's Wacky Guys With Crazy Space Magic around, the ability to get said Wacky Guys With Crazy Space Magic to do stuff for you is primarily accessible to people with Money, and so Fionnaworld's old power-dynamics remain mostly resistant to actual change.
However, one advantage Cake still has is this kind of system is her mastery of the power of Butt.
The most powerful Force in the Adventure Time Multiverse.
