What is a "5k max loss"?
A little detour first--
Almost all of these funding companies are number magicians. OneUp says $150k, and then you have up to 15 contracts to trade simultaneously and a max loss of $5k on the account.
LeeLoo specifically says "15 contract account", and does NOT say $150,000 because they know the $150k is a lie. Yet the platform has to say something, so they chose $150k anyway, LOL.
What is the true value of the account? You can figure it one of two ways:
A) MAX LOSS. The max loss is $5,000. So the max value of the account is $5,000. End of story. If you lose $5,000 then you are dead.
B) AVAILABLE MARGIN. The equivalent margin required for 15 contracts is about $6,000 if you estimate $400 daytime margin per ES contract. However, I think both OneUp and LeeLoo allow you to trade SILVER which has a margin requirement of about $5,000. If you multiply this by 15 contracts, then the account is "worth" $75,000.
So which is it? Of course it is A. B makes no sense in the real world.
So to answer your question, a "Max Loss of $5k" means if you lose $5k on the account you will lose the account. There is one exception: If you grow your account to $6,000, then the max loss grows with you. $7k, $8k? the max loss holds firm at an account "balance" of $150k.