By 'freelance writing' I don't mean blogging. Although, really, the line between blogging and freelance writing can get pretty blurry and, indeed, can overlap if somebody offers to pay you for blogging.
But a freelancer isn't an indie publisher. He generally only chooses what he writes about insofar as he chooses which publisher to offer his services to. You can't hire on to produce text content for, say, an automotive magazine and then just throw up your hands one morning and go, "Aw, what the hell, let's do a piece about big bouncin' titties today." Well, you could, but you wouldn't collect on the invoice for that piece. Or... y'know, any more work for that publisher, either.