So far comments are pretty judgemental; you should know that male, neutered cats tend to gain weight with standard diets due to hormonal changes. Pair that with indoor-only lifestyle (which is very recommended for safety) and a dry food diet (which isn’t recommended but is cheaper) you have a good chance at a cat gaining too much weight.

Yes, there will also be people who just spoil their cats, but so long as we’re neutering and keeping cats inside then a weight loss drug might be reasonable to offset those factors.