Here is an alternative that aggregates from multiple sources: https://www.thefreedictionary.com/
While I do not oppose paying for definitions, there is someone confusing about collectively generated meaning being aggregated and packaged by one company for profit. A publicly maintained dictionary is a much much better alternative. I guarantee it would be more versatile and rigorous than this Oxford stuff.
This is next level. I wonder if this is really possible. Like, do they have control on these things? I am thinking of a mass resistance where people make barcodes and go to these places to stick their own fair prices and pay. But may be we are not there yet.