In my experience most people doesn't bother to go to court or even raise a complaint. This includes some friends of my family who would just get a refund and if they still would go just rebook it on a different airline. Would they be angry, not that much. So I can guarantee that about 80% of the people whose flight canceled to BKK by BA will just get a refund and the best is, only maybe 50% (if that much) would be angry or upset about it. 20% will try and call and rebook, etc and only about 0.1% will lodge a MCOL case or any complaints. The other problem is that the regulator and the law has no punitive measurements to stop this practice. The regulator will write an another open letter to the airline industry and that's it. Until the airline is not facing any criminal charges nothing will change. BA's point of the view the refund is the best option because they not loosing any money. Anyone who booked and paid all that money is held by the credit card companies and only get paid to BA when you flown the ticket. The only other loser is the credit card company who can't use these funds to invest and make more profit on that. So BA have 0 interest to solve these problems. This is not new, it's going on in the past 10-15 years at least.