There is still 10 days left. Even though the stretch goals were met, you can still sign.
If you haven't already and you live in the EU (they will check), you can sign here: https://www.stopkillinggames.com/
So your suggestion is instead of any attempt at regulation people should just boycott a company years after they've already given that company their money, despite the fact that you admit n even more ideal circumstances boycotts still do not work?