I asked the customer support about exploits
I asked if using targeting through an acid block and killing Harvey at the start is an exploit.
They answered like a politician the first two times and after 3rd time I asked for Yes or No answer. They still answered like a politician.
It seems that they have not yet decided if those are exploits or not. They could not say even that.
Update: Exploits mentioned above are free to use without fear of any change to your game experience from the devs. So no bans, cheater lobbies, and such. So there is no point in reporting anyone for using these exploits. You cannot be protected from being blocked though.
The current situation may change when exploits are defined.