I do my taxes manually entirely on paper and send them in. I don't want H&R Block, Intuit, Taxhawk, or anyone else to have that information that they will then turn around and monitize. I also like the painful yearly reminder of the unnecessary burden the government is placing upon its citizens. For the majority of W2 income earners, the IRS already has everything it needs to compute your taxes and send you a refund or a bill in mid-February.
Okay, but if you're going to go enter all your info onto a for-profit company's website anyways it's a massive waste of time to then go copy all the numbers to a different place. That was my point.