I feel like I've been gaslit into running FOSS but every success only brings me closer to fighting god
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the Chrultrabook project is what youll wanna look into, but basically yes. You can reliably get new-ish hardware very cheaply and flash FOSS stuff like Coreboot onto it.
No idea why tbh. The equivalent laptops outside of ChromeOS' ecosystem are usually much more locked down, to the point where the most powerful systems you'll find being able to run Coreboot are decades-old thinkpads on 3rd gen mobile i5 and Kepler mGPUs.