Why do no deposit casinos offer free welcome bonuses?

Why do no deposit casinos offer free welcome bonuses? Bingo credit is another no deposit bonus type. This will normally come in the form of...

Why do no deposit casinos offer free welcome bonuses? Bingo credit is another no deposit bonus type. This will normally come in the form of 24 hours free bingo in a particular bingo room, or 500 free bingo tickets to get you started. These are a little less available at the moment, but for example...
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