Of course you can boycott whomever you want. But calling others to boycott stuff by your standards is another thing entirely.
And to make matters worse, your test for ethicality is not the result, but the method used.
Also, there is not a way the law ought to be, there is only a way you think the law ought to be by your standards. If you convince enough people that your standards are necessary, this will be implemented, at least in the democratic jurisdictions. This is at the bottom of my view that indeed waiting for legal discussion should be done and not merely because some people are offended and call it unethical.
I have not heard good arguments yet, to be convinced.
If I understood correctly, you think it is unethical because permission was not asked in creation of the tool used, and thus, the works made with said tool should be banned.
But there is another situation, where the whole creation is based on other people's ip and permission is not asked either. All those fan games and even remakes of popular games. So if the unethicality of not asking permission is enough, all those stuff should be banned as well, should it not?
To me it is more important what you make, to call it unethical. So unless the AI is used to plagiarize, why should I care.
On another note, if I use a paint brush made from animal hair to create art for my game, would a vegan gamer want to boycott me? ;-)