Microsoft - erosion of any motivation to understand your PC so they can put whatever they want in their updates and you won't know until you dig through the logs
Facebook - erosion of any critical thinking by rewarding echo chambers and groupthink. Just look at their Metaverse shite.
Amazon - erosion of labour standards and publishing anti-union propaganda to prevent workers from realising they're being abused. Also, instituting anti-competitive measures and strongarming third party sellers.
OpenAI (insert any LLM/generative model company) - erosion of the creative process thus allowing people with zero artistic expression to plagiarise other artists' work
EA (or any AAA studio but also Nintendo) - erosion of consumer rights to own the products they buy and preventing any effort to preserve their games AND THEN complaining about piracy.