Nothing has changed about the way I use Bitcoin. I use it like money and savings. The introduction of these businesses and their services into the bitcoin ecosystem is entirely opt-in. If they ceased to exist, I could continue using bitcoin like I have before. They didn't take over anything. If (big if) blake2b enjoys any success, businesses like these would naturally appear at the margins and start using the technology in novel ways. And I'm sure that will whip some fundamentalist zealots into a frenzy, and they'll fall all over themselves to hit the reset button again and find themselves 10 years behind as a result.