I think many of us who use Libre have type 1 diabetes.
I am sure there also some with type 2.
The value in the Libre is the trends rather than the instant values. The instant values may be out but generally your BG goes up when the Libre says it goes up.
This means you can use the Libre graphs to understand what impact various foods, activities, stress, time of day, ... have on your BG and start to make changes to avoid the spikes. For example, when you see the spike you get from bananas you may decide to cut them out of your diet whereas many people say they cannot eat porridge but you can see with the Libre it does not cause much of a spike for you.
Some people use a Libre all the time.
Others use it to gather information about spikes and then just use it occasionally to check things haven't changed. This approach is, obviously, cheaper and you are less likely to experience allergic reaction through prolonged usage.
But, you do not have the constant view all the time.