Thank you Mat for reaching us out. I want to let you know that you're always welcome to signup whenever you want to use the service.
And also we had no database issues or overload but we're trying to have less users as much as possible. We're trying to have active users only in another language.
And also we understand that 360p isn't attractive definition but this action has been taken to avoid spam users who signup and upload a lot fake videos (Like uploading the same video more than 100 times) to harm our resources and in this case if the default option is HD our resources will be affected. ( Most people who abuse our servers are DMCA companies agents

)
However, you can have the HD encoding option as soon as you confirm your site traffic which is very easy by uploading only one video to your site

And then we will be able to know that you're the real owner of this sites and enable the mentioned option for you. But keep in mind that this option require at least good traffic in your site.