Because hosting my own server and disabling the auth is about 1000 times the effort of clicking "start a new meeting" on their website.
I don't get these "why can't you just..." comments. It's like you complain about food in the restaurant, and someone saying: "well, you can cook your own lunch at home differently".
No, this is like a restaurant giving you free food, and then when they change the recipe, you saying "WTF, you changed the food and now it's too salty, I hate it. Yeah, I could cook my own meal, but screw that, I demand you fix it!"
I don't get these "why can't you just..." comments. It's like you complain about food in the restaurant, and someone saying: "well, you can cook your own lunch at home differently".