I develop websites for clients. Once, a client complained that i'd added all kinds of extra links to his website. It turned out that he'd downloaded an IE virus that was adding those links automatically to the websites he visited. Another client woke me up at 6 in the morning yelling at me that he was receiving some spam email once a minute and i must stop it now! It turned out he'd downloaded a virus into his Outlook program. I've got other clients who use Macs, never had such problems.
I'm implementing this one website now. It works great in Firefox, Opera, Safari, then looks like crap in IE... Even if i refuse to buy MS products, because so many others do, my work is affected by them. So telling me to "just don't buy their stuff" doesn't work.
It's called "consumer protection". Even in the States where money is king and "government intervention" is frowned upon, there are many such rules, e.g. seatbelts in cars. In the EU, which is the context of this post, and many other countries outside EU, there are many more such laws. Not at all abusrd.