I don't think it's some conspiracy to make anyone more likely to get malware. Instead it's that for their business model of mostly being used on business PCs where the same dozen tools are installed all over the world they can be overzelous in protection and it is what most customers want. Really, they should leave the "piracy is malware" thing in defender, it should just be off by default if your PC isn't connected to a domain or setup as "work PC".