There seems to be a lot of context missing from these articles.

Mercado Libre has its own payment tech. They're like a latin american Amazon+Stripe. I don't know if that plays a role in what is being disputed, but it is worth mentioning.

Mercado Libre also started distributing Disney+ content, similar to Prime. If you buy stuff often, you get a good discount in a Disney+ subscription. This seems to be related to the complaint about restrictions in digital content distribution.

The whole interaction seems to be public (email exchanges and documents, in brazillian portuguese):

https://sei.cade.gov.br/sei/modulos/pesquisa/md_pesq_process...