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Those would be different kind of regulations. Not just ‘you need functioning brakes’ kind, but also ‘you must serve this route that hardly anyone uses and and you cannot make any extra money from’. Or ‘no extra fees, even where some people would pay them’.
Non-toxic glue would be starch or gelatine - both used as base of some ‘real glues’, both with valid culinary use, including exactly this use case. We just don’t call those ‘glue’ in this context.