She's transitioning from the McCandless VIP page to the Onlyfans VIP page because she likes the fact she can hand the account to the chatter service, give them some sfw content to upsell for gouging price-marks, and not have to ever talk to or interact with her fans while still making loads of money.
If it wasn't explicitly against Onlyfans T.O.S. to allow third party access to an account, I'd say whatever makes her happy she can do, but she's getting away with the violation with no consequence. Countless folks have reported her for the breach of T.O.S. and Onlyfans hasn't held her accountable.
Also, I imagine she knows when she can ditch the McCandless page (i.e. when the contract with them ends), and really hasn't wanted to put any energy into it beside the bare minimum of her contractual obligations.