That was also an idea that came to my mind.
Implement a fee on profits and make the software itself for free.
That's also a way to guarantee longterm revenues for the developer.
And everyone has the possibility to try it out.
I think that is the most ethical way and everyone wins on it. Are you a developer?
I can handle some java implementations - but I'm not good enough to build such a bot on my own.
I know some ppl who would do it for money... so I'm thinking about it.
If I pay money to some developers then I need to make profit with the bot... but I'm not sure if ppl would accept the fee or even use the bot...