Why didnt my african giant land snails eggs hatch?
…because you got lucky this time. Giant african snails will lay hundreds of eggs in their lives and they are virtually impossible to re-home or sell on. I would strongly suggest that any future eggs you should crush or pop into the freezer to kill them before they hatch. If you want more snails then I guarantee that there will be plenty of other people over-run with babies who will be very glad that you can take them off their hands.