Cobalt and Tantalum are mined by child slaves in the Congo, smuggled to Rwanda and Zambia, then branded as "ethical". Rare earth refineries destroyed Baotou lake in China, rendering surrounding villages destitute, and threatened to contaminate the groundwater that sustains a huge portion of the Chinese population.
If you look into other materials that electronics depend on you'll see similar problems.
Electronics cause astronomical suffering.
[1] https://www.bloomberg.com/news/articles/2018-02-20/deadly-mi...
[2] https://www.theguardian.com/environment/2012/aug/07/china-ra...
[3] https://www.newsweek.com/2015/02/13/where-apple-gets-tantalu...
[4] https://www.amnesty.org/en/documents/afr62/3183/2016/en/