Even Sant Jarnail Singh Bhinderwale said the same thing, the word Hindu does not appear in any Hindu texts, and when they refered to this religion they would call themselves Sidhu, (which means of the Sidhs/Bhagti or Magic, I don't know what Sidh by itself means unless used with another word). As you know Islam invaded India very early on, so those first Muslims called these Sidhus, as Hindus. Why Arabs gave-up this word in their dictionary, I don't know. Arabs are mostly Muslim-In-Name-Only, the groups that are usually more devout are the Non-Middle-Eastern Muslims, (with the exception of Iran, which became religious due to the some false agitations on the last Shah and secular groups).
What's your source other than "someone" told me? Are you that naive that you'll believe anything anyone tells you?
The money these people will make will sustain them and keep them afloat financially allowing them to feed themselves. They're not making millions and sitting on untold riches. There's no profit involved and at the same time they are encouraging people to embrace Sikhi. Why is that a problem? Having full time prachariks who are devoted to doing just that is 1000x better than having someone who does it as a hobby. They'll take it more seriously and are less likely to prioritise other jobs over it.
This might shock you but not everyone is the same. Even within religions people's thoughts and feelings on God can be wait for it....drastically different from the norm. Christianity is a broad term for a whole myriad of beliefs/sects that came or claim to come from Jesus Christ.
What's biraderi? I heard it was related to incest, is that even that common in our lot of Punjabis? (I know Muslim Punjabis do this incestuous biraderi, but not from Sikhs?) 😨😱 Creepy as hell if you ask me.