Is it a hobby or business for income tax?

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I didn't make enough online this past year to worry about it anyway, but I was wondering if the money we get online from sites like this, and GPTs, writing, etc, are considered business or hobby income. If business, we would need to pay self-employment taxes, but if its hobby, you can claim it on the regular tax form. I don't think I spend enough time and effort at it for it to be considered a business.