Speaking of Amber, I find Chintal's new "friendship" with her to be fascinating because she also does this with Al, although a touch more subtly.
Who can forget Chantal barging into Amber's comments boasting about having everything figured out: how she was seeing an obesity doctor, getting therapy, going to the gym - and then "challenging" Amber to follow in her footsteps and get on her level.
Although she's definitely motivated by the views and more binge $$, I have a crazy tinfoil hat theory that the Torrid Haul she keeps promising (if she stops stuffing hamburgers in her face-hole long enough to film it) also may be a way to assert her superiority over Amber. Torrid hauls have been Amber's bread and butter for awhile; I imagine she's going to try and outdo her by squeezing into a smaller size and attempting to improve on Amber's formula.
I don't think she actually likes Amber, in fact I'd like to see more footage of her interactions with Rena because I don't think she likes most women in general. In 99% of her stories women are described as "bitches" and "whores" and are seen as obstacles in the way of what she wants (Men, food or the opportunity for minimum effort with maximum benefit).