Take on the tax of a kindle book

Can somebody explain to me why the hell I am getting charged tax for buying a
kindle edition of some crappy fantasy novel.   Getting taxes on a physical book is one thing but on something you don't physcially own, this seems like major government overreach
I have never seen this before so maybe it's specific to this genre, call it a dork
tax which like a tax on fat people, I'm all for (hi mr mayor)

But I don't like the precedent this dork tax sets,  I don't get charged tax for
streaming a movie online , reading the NY Times online or anything else
Next thing you know, you'll get a tax bill for reading TOR