If someone told me they were doing this I would point out that this is against the terms and conditions of the frequent flyer program(s), and that there is a very high probablility this scheme will eventually be uncovered. Then they will lose all their miles in one or both programs. I doubt that the airline would prosecute or attempt to recover revenue from fraudulently accrued and redeemed miles? Then I'd leave it up to them to decide if they wanted to continue with this practice.

The lamp thing sounds like extortion to me but I'm no lawyer.


Edited to add;

a.) Double-dipping as a result of an involuntary re-route was, I thought, perfectly acceptable to both FF programs. I've never had to take advantage of this.

b.) Some FF programs have lower status thresholds for residents of certain countries. More than few people circumvent this by establishing a questionable or marginal domicile (a friend accepts their mail, they use a business address, etc.). I think this fraudulent.

c.) Some FF programs target offers to certain customers, based on their address, of competitive FF programs. Some of these programs are incredibly generous, maybe offering to match their mileage balance in the new program. Many people circumvent the residency requirements with a bogus address. I think this is fradulent.