You have to be willing to go to court, and be able to afford that. And even if you did, they probably settle right away and out of court. Easier and cheaper. Nobody will go through the trouble for a couple of bucks and that's what they all count on. Now, if you got a couple of thousands of dollars in it, that'll change.
CIG settles immediately if you threat them with legal action. They won't ever go to court until they fold, so the amount doesn't matter.
Valve is a different story. They go beyond what the EU law requires (few hours of playtime) for distant selling refunds, but they do it to deal with the more strong warranty laws in a convenient way. If you make a good case ("game crashing after the tutorial"), they will refund you even after 14 days and hours of playtime. It's just not an automated process. It doesn't cost them, only the developer. You don't have to go to court. Valve's competitors go even beyond that. GOG has a 30 days refund with no playtime limit.
What's more important is: Whatever you clicked through to make your payment (like the Kickstarter project description) and also the generally available advertising material / public press reporting is part of the contract for a consumer purchase. Any warranty and grace periods don't even start until that is delivered.
For a Kickstarter backer inside the EU that means, as long as
Real quick, Star Citizen is:
A rich universe focused on epic space adventure, trading and dogfighting in first person.
Single Player – Offline or Online(Drop in / Drop out co-op play)
Persistent Universe (hosted by US)
Mod-able multiplayer (hosted by YOU)
No Subscriptions
No Pay to Win
doesn't appear at the consumer's premises, nothing can expire legally. ToS doesn't matter, because EU consumers
cannot waive their rights. The latter is a really important part of consumer protection, because otherwise it would be worthless (every shady company would circumvent it). Complete contractual freedom only applies in B2B transactions between registered commercial entities, consumers are protected, even against their will.
The interesting thing is how CIG now tries to make MVP 2.6 or 3.0 the effective legal purchase item for new customers, so at least for those they fulfill the legal obligations by delivering the MVP. But does this work in EU? I don't think so. What matters is what uninformed consumers expect when they buy "Star Citizen". Like after attending to CIG's presenation at Gamescom, after watching videos published by CIG, after reading Gamestar reporting. Everything what is endorsed by CIG becomes part of the contract. Consumer protection explicitly relieves the consumers from doing deep and throughly research for every purchase, just as they don't expect them to understand legalese in ToS documents.
To get rid of refunds, CIG has to
...pull all advertising and made up demo reels for Star Citizen.
...honestly describe the MVP, ideally paired with a specific name ("Star Citizen Stanton") separating it from the fantasy.
...get the message out in media outlets who reported on the non-existing fantasy product.
...stop and correct shills theory-crafting on social media.
...stop selling concept ships.
Only if the unsuspecting consumer knows exactly what he gets without going through pages fine-print, CIG might be able to get away with selling a MVP.