Why can't grapefruit app log in?

There are generally two situations. First of all, the Youtu APP system is under maintenance. The second is that the Youtu APP has been removed and cannot be logged in.

Temporarily unable to log in should be the normal maintenance, update or upgrade of the application. In this case, there are relevant notices or notices detailing the time before app maintenance, so don't worry, just wait patiently. If you can't log in for a long time, there are two situations. One is that you are not going to do it. After a period of time, you will generally send relevant notices to deal with the aftermath, and the other is to run away maliciously.