I also send trash traffic, as you guess from my user name and avatar picture, to PPL and CPA cam offers, including bots, and I was never banned in 6 or more years by no any network. I used chaturbate, crakrevenue, tubecamgirl, bongacams, and some others that are now closed (but most these paid before to close anyway).
Of course my sign ups was real people. If you create fake signups yourself, you waste time only.
But real people signups is not enough. As the other guys said in the thread, if your signups never convert into sales, the network will stop paying or switch you to rev share.
Come on, if you owned the network, you would do the same, you are not santa claus?
Then how to be paid for trash traffic for long time? If you know your method is chat traffic, bots or something that do not convert in rev share or PPS, then my suggestion is to contact the affiliate network before to start, instead to earn $100's and wait the network write you first, saying your traffic is bad or even banning you.
The OP earned $400 before that Chaturbate could check his signups quality. When found it was low quality and no sales, maybe decided, better to not pay $400.
What if the OP contacted Chaturbate before to start, presenting himself, asking if that's ok to use his method and bots. If Chaturbate replied positively, then, it would be more difficult for Chaturbate to ban him after. The OP could have made just $50 payable worth of signups, pause, and again contact Chaturbate, asking what they think of these few signups. Only when Chaturbate replies, you restart doing more signups.
The same advice is for when you start with every new CPA network, better to contact first, make them friends, tell them if it is ok what you want to do, send first $50 maximum test of signups, ask what they think. Never start in silence, and earn $400 on surprise, this is a risk if you're not making sales.
Some networks write such common sense in their affiliate instructions page. For example look what is written at the top of tubecamgirl affiliate page:
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NOTE ON CHAT TRAFFIC (OMEGLE / CHATROULETTE / KIK / FB / ...): if your method is skype/yahoo etc. chat traffic direct sales via human agents and/or bots in chatrooms, needs pre-approval (contact us before to start!). Do not use microworkers, rapidworkers, mturk or similar, it brings only fake signups with proxy/vpn that will not be payable. Even if accepted, for chat traffic we pay CPA $1 or max $2 per signup (depends on results), not $3 as clicked banners or other methods. If incentivized (promise off-site prize, such as free messenger show if he register etc.), we do not accept at all. And if chat traffic, ask the age to guys first! Send only who is 25+ years old or older, we don't want younger, they just offense and troll girls and never pay.
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This is reasonable, so $3 CPA for who convert in sales, otherwise you discuss in advance for lower pay if you send trash. If not all CPA traffic is same good, is common sense is not all paid same. Better than not paid at all, you guys email the network before to start, and make small test and ask to check the signups, before to work weeks and collect $500 payable, then get nothing!