Actually, in Australia and NZ (not sure on the situation in the US and elsewhere), empty threats to sue to enforce intellectual property rights are illegal (I am an Australian law graduate, not practising, this is not legal advice).
It's sad that folks like this seem to think that threatening to sue at the drop of a hat is a perfectly acceptable business tactic. It's especially sad in a case like this when the intellectual 'property' (it's so ephemeral in this situation that quotes are needed) concerned involves an idea that almost everyone who has thought about location-based services has had. (No offence to Andrew and the team, they seem to have actually executed it and executed it well).
It's sad that folks like this seem to think that threatening to sue at the drop of a hat is a perfectly acceptable business tactic. It's especially sad in a case like this when the intellectual 'property' (it's so ephemeral in this situation that quotes are needed) concerned involves an idea that almost everyone who has thought about location-based services has had. (No offence to Andrew and the team, they seem to have actually executed it and executed it well).