For the love of god they are offering 80% split and eat losses, THEY make the rules not YOU.
Of course they make the rules! Nobody is disputing that.
Let's go over the flaws with your post:
1. "They are offering 80% split and eat losses."
Yes, they are going to eat losses, but ONLY during the first 10 days of the live account! Obviously you did not thoroughly read the funded trader rules. During, and ONLY during, the first 10 days of the live account, they will "eat losses." In other words, if you start trading live and go negative, you are not responsible for those losses.
However, once you start trading on the 11th day, you MUST be net positive, and on that 11th day going forward, that positive "cushion" is YOUR profit. If that profit goes back to a "zero" balance, then you are sent back to the combine.
I already went over this example, but I'll do it again in case it wasn't clear: If you made $1k in during the first 10 days, then THAT $1,000 becomes the cushion. The 80% split applies to any profits withdrawn after the 11th day. They are NOT eating your losses post 11th day, since that $1k is YOUR cushion, you made that profit during the 1st 10 days. If you lose that profit, then you are done trading the live account, since you cannot go below a "zero" balance (in other words they do NOT "eat losses" anymore). If you managed to bring that $1k to $5k, that is YOUR new cushion. If you dip back to $3k, that is still YOUR cushion. They phrase "eat losses" after the 11th day applies to the 20% opportunity cost of not being able to take their 20% if you did not take a check, since they only take their 20% when a trader makes a withdrawal. However, the backer is not losing any maintenance equity required for you to trade the account.