New sign-ups (Account creation) are disabled during Lite Mode and Limited Lite Mode.
During Limited Lite Mode, some users will be in Lite Mode, and others are not. Pioneers are randomly selected throughout the entire network, and it should not last for more than 24 hours. It is possible that someone in the family or household can be in Lite Mode and another not. Limited Lite Mode allows the Core Team to perform maintenance on servers and reduce the impact on Pioneers.
In the past few days. Limited Lite Mode has been turned on from time to time, due to server work.