- It is allowed to own alts.
Yes, it is. Many reputable forum members have alternative accounts for different purposes. So as long as you are not using them for bad practices, you should be good. It's even better if you declare that you have an alt account so that everyone can see how you use the other account.
I don't know why people keep answering the one when it wasn't a question. It was just a statement while the other two are questions. Yet they are scared of giving explicit answers for number 2 and 3.
making them have different identities and hiding from the community that it is you behind those alt.
This is not a crime. In some cases, making the community know you are the person behind the account defeats the purpose of having the alt account.