Hi panjul!
There is a reason why we have the no deposit free bets set this way and it is because we are an anonymous casino. This means that abuse from opening multiple accounts would be very easy.
I would rather build a proper faucet instead of having one player claiming an entire campaign with a hundred accounts.
You claims yourself as experienced devs in this gambling industry, is it that hard to detect multiple accounts? I'm sure many other sites that do not even claim themselves as experienced devs has their own system to protect themselves against abuse by multiple accounts. You are so afraid with multiple accounts will abuse the bonus means that you do not have good system against it.