Many sources, spanning many years, and both private (such as newspapers or NGOs) as well as governmental (e.g. the UN), have found that an overwhelming percentage of razed rainforest in Brazil was used for cattle farming [1][2], with a large part of the remainder going to large-scale soy farms, and a tiny bit for small-scale subsistence farming.

[1] https://en.wikipedia.org/wiki/Deforestation_of_the_Amazon_ra...

[2] https://www.hrw.org/news/2022/09/14/devastating-burning-seas...