Because of the editor, not the game nor the studio, let's not forget that.
If there are that many, list 3 please, because I seriously doubt it's ever out of their control. They often just compete in over saturated genres or make terrible design decisions and pay the price.
And an handfull of anecdotal failures doesn't prove it's luck either.
You should read a few posts up.
Infiniminer was a good idea but very badly executed and very limited both in it's potential and it's appeal. It was more like what if Minecraft happened in a single chunck and was centered around PvP only?
Minecraft on the other hand went the route of sandbox, construction of elaborate structures, exploring an infinite world and what actually made it famous: using Redstone to create all kinds of mechanisms.
I do agree that it's still horribly implemented, loads of half assed ideas and concepts to the point that there are a metric fuckton of mods, each with more effort put into them than the base game. Thaumcraft alone is a better game than Minecraft, for instance.
But this doesn't mean that Minecraft still tried to be it's own thing, distinct from Infiniminer, or that it wasn't original in the gameplay it presented, despite how simple it looks.
For comparison, there's a game out there about running around with paint guns and covering the walls and floors with your team color, a game that came way before Splatoon. Does that mean Splatoon copied it? Nope, it came up with it's own mechanics regarding Squid-form, it's own world and lore and it's own weapons and game modes to set it apart well enough it can't be considered a copy of that anymore.
But hype costs money to generate, from bribes to ads and parties or just lots of pretty rendering bullshots.
Seriously, go check on how well some of the companies that pulled that off are, finnancially speaking. Inafune had to start a kickstarter for the other game he was making since there was nothing left from MN9.
And still, there's the important disctintion to make: we are talking about a successfull game. Something that gets a lot of sales but utterly ruins your credibility and whatever chance at a sequel is not a success.
Mass Effect 3 made enough money to justify a sequel, despite the backlash. Was it a successfull game? Nope. The amount of sales was not up to luck but the quality of the previous 2 games, and Andromeda suffered heavily because of how shit ME3 was.
Dragon Age 3 was in the same boat after DA2 so I predict that DA4 will be another Andromeda.