[Keith]

Big change for the Celebrity series. Viewers will be voting to save rather than voting to evict on eviction nights.

x.com 

Voting to save seems to be a fairly standard thing on shows involving celebrities, and I think I'm a Celeb has done possibly it since the beginning. I imagine that a lot of 'celebrities' and their agents would otherwise refuse to sign up. After all being evicted because someone was slightly more popular is less career damaging that being evicted due to being the most unpopular/hated.