In most countries, technically, a 6 year old’s lemonade stand needs a license and to pay taxes on their 72 cents in profit.

But nobody really cares about either.

Until it becomes a business, it’s a hobby. If you’re not earning thousands in revenue per year, treat it like a hobby.

Obviously, lots of caveats with that approach (e.g. your product has a high chance of killing someone), but meh, just start.