Not all plastic ends up in the seas. It’s not always the plastic bottles company fault that plastic is being put in the water, it is the consumers that play a big part in pollution. To save your “beautiful sea creatures” you should be finding ways to make people recycle and not just crack down on companies for all the damage that occurs.
It would not be an economic set back to come up with a new way to make biodegradable plastic because it would open many jobs and opportunities for engineers. This would be a step forward in the economic world, we are creating new jobs while finding a safe way to eliminate used plastic safely.
Water bottles are not the only plastic that is causing harm, so to make a change that would have more of an effect you would have to make every company stop using plastic. It would be unfair to single out and only have water bottles change from plastic to another material, setting them back in the market industry.
Using a different material to make water bottles would be a huge set back to the companies creating the water bottles. it would be an economic set back, and would be a time consuming process to have every company come up with a new solution to the ban on plastic water bottles. It would be a more sensible to come up with a biodegradable plastic, that is better for the earth and solves the harm that the plastic is creating.