Just pass a law that anything intended to be disposable needs to be made with 100% biodegradable material. Selling refillable oil is obviously cleaner and cheaper to make.
This is just profit over planet.
Already the case in Germany, yet everyone still just throws them away out of convenience
Then they lobby a law to define 100% biodegradable and the lobbyists successfully push for it to mean it will EVENTUALLY bio degrade*
*In 1000 years
It would need to be naturally biodegradable without leaving any kind of dangerous chemicals. A lot of so called biodegradable plastics can only actually be biodegraded in an industrial compostor.