A policy for cafes (and other food and drinks serving businesses) to charge an additional price whenever a client orders coffee with cow's milk instead of vegan milk. This could apply not only for coffe but any product that is prepared with milk, e.g. tea, cacao, cereal, etc. My friend came up with this idea.
Currently, it's common for cafes and other dining places to charge additionally for vegan milk. There's no good reason for this. While the market price of plant milk is often higher than that of animal milk, it's not significantly higher and the fee for choosing vegan milk with your drink/meal at dining places can be up to 1 € and perhaps more in some countries - you can buy a whole package of plant milk in a supermarket for that price.
This is sad, considering that this way customers are discouraged from a plant-based lifestyle in times when it's becoming more and more popular. It should be vice versa. By turning this around businesses would promote plant-based lifestyle which would lead to:
less animal cruelty
Some plant-based lifestyle oriented cafes serve drinks with plant milk only, they don't serve animal milk, charging additionally for drinks with animal milk could be another strategy for such places - they'd get additional income and make a statement that way: "if you can't go without animal milk, you can have it, but you have to pay for it additionally".
Such policy would imply that animal milk is something society should currently be turning away from. Naturally, not all businesses would want this, but it could at least be a contra move from those businesses supporting plant-based lifestyle.