I would like to provide a confluence account for each of my customers companies. But I have two problems:
You cannot block an user to edit his own profile, unless you try to do some customization but I believe it won't worth it. And, if you want to create an account for many people use the same account is not a good idea. If some day something goes wrong, you wont be able to know who made that.
For your second questions, please have a look on this documentation:
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