No high frequency trading.
No financial targeting the vulnerable (subjective, use your own ethics and good judgement)
No dragnets
No devices to disrupt tor or P2P networks
No troll farming or mass media manipulation
No fake dating profiles
No metric stuffing
That’s it off the top of my head. I know that sometimes secondary effects can happen (e.g. an oppressive government may use a database, and I might work on that database) but that’s not me directly helping them.
Something like this, feel free to add others everyone!