Why can’t something be both for profit and for the environment?
Because inevitably the pursuit of profit takes priority over better solutions. Case in point, recycling has also reduced the amount of plastic waste around, however really that’s just fuelling a waste processing industry that opposes re-using of materials - not without reprocessing through their business. Meanwhile, if you look to countries like Germany they’ve put business profits to the side and created a system that re-uses glass for almost all drinks, all now completely maintained by the income of its deposit system.
And if reusable containers become a thing, I promise you there will be people whinging that it’s profitable for the groceries that they’re selling bottles that you used to get for free with the soap or whatever.
Well, if they were charging you for the use, then yes that would be reasonable to complain about. They should be providing them with a fully refundable deposit - you return them, you get your money back. If you look at re-usable water bottles, that market has exploded with a bunch of over-priced crap, rather than the best solution being mass produced and distributed with the product.