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 They are competing for blockspace even with Segwit. Not that it would stop spam.

Please do research. 
 with a discount, please do some research 
 normal transactions also get a discount 
 A normal segwit transaction is 60% witness.  A spam is 90% witness or more.  This makes spam cheaper per vbyte.  But I think you know this you're just being argumentative. 
 after actually examining some of them, looks like a lot of inscriptions are 99% witness data.... so.  yeah.