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are the FPGAs going to space? I'm intrigued on how you'd make sure a cosmic ray doesn't accidentally reprogram it
When you're launching something bigger you're going into a high orbit (longer lifespan) and you have to deal with more lifetime radiation. Costs are not linear either. So at a larger scale you rad harden because your launch cost is a significant cost to you. We're talking satellites that have tens to hundreds of millions of dollars worth of hardware on them. Not only that, but the satellite took years of work. Here failure is not an option.
But for actual hardening, typically you use sapphire chips instead of silicon. There are other things you can do like encasing in different materials. Multi layered and doped plastics are common now (I actually did some work 3d printing shields, intending to be low cost).