Yeah, NESes are pretty durable, and its worth pointing out that there have so far been *very few* cases of an actual damaged console, and I seem to recall those were from people who were using things like Everdrives and these multicarts almost nonstop.
This problem has existed as long as repros and flash carts have been a thing, yet its only now we're hearing of problems. That's not to downplay the potential issues, just to point out that you don't need to be paranoid that one game is gonna break your NES.
EDIT: Additionally, I'd have to doublecheck but I think the article *I* linked to mentioned that some *officially licensed* cartridges from back in the day had the same kind of problem (I think he specifically called out Atari/Tengen, though I think he also specifically mentioned their Genesis games)