Adrian I don't get what you are warning people about.
Is it because the Rainbow had made a mistake or an operator did and overbooked.
Was the warning because the Rainbow did their best for these guests and put them into the nearest
hotel of the same standard the Efes which is that close to the Rainbow you could climb over one wall into the others pool (which I may add the guests from Efes do).
I don't see anything wrong here and in fact fair play on the Rainbow for not just bumping the operators customers and putting them into the Efes on bed and breakfast basis but actually letting them still have their all inclusive at the Rainbow.
Well done to the Rainbow I say for fixing an awkward situation