Earlier quoted context omitted.
You can fight against it by refusing to use these websites? If you can't do this, perhaps because a big _majority_ of users don't care enough to support this kind of ecosystem shift, what makes you think a majority of voters would support this? (And if not, why would you want to force your view on them?) It's like legislating that people should only listen to Good Music and eat Healthy Food, as defined by some people…
I rather think it's more like legislating that you can't sell people food adulterated with poisons, and you have to label the ingredients accurately. Oh, and it's like saying that you can't sell lead paint, even though it is a very pretty white.
So a law specifically forbidding poisons is in line with what the majority already cares about.
(Slightly related: see eg some Chinese people making good money from buying baby formula overseas and shipping it back home in their luggage. China has legislation against poison, but people don't trust the enforcement enough.)