Of course it's in blue... not like transforming landscapes fits all colours. No blue gets it because
he has a boner for blue
Honestly, if any color gets the "Non basic lands are X", it feels like a White thing to me. For me, ideally, this would be how land effects were:
White: Non Basics have X Effect( Blood Moon, they cost life to tap, enter Battlefield default tapped,etc)
Green: Doubling of Mana/Additional Mana per land
Red: Freedom(Think Spreading Seas, but the land taps for anything, cast on yourself)/Stone Rain
Black: ???(best I can think of is Mana Confluence-esque effects, where you'd be giving up Life for perfect fixing)
Blue: Single individual land morphing(Spreading Seas, Aquatect's Will, etc)
So I agree with MaRo that blood Moon isn't a Red effect, but it's definitely not Blue. It's an established effect that impacts All non basics.
Edit: I should add I do think Red has the worst color pie because they keep on giving a bunch of it's effects to Blue. I mean, the biggest issue is that it's hard to put "Free Spirited" into game mechanics beyond rummaging. I do like Polymorphesque effects as Red Primarily, because "Get rid of this right now", not caring for the consequences is very Red to me