Oh man, @the_jesse is right about moisture wrecking everything. I once tried to build a storage shelf from leftover boxes (a real brilliant idea) and it basically melted into pulp when my basement got damp. That soggy mess taught me that any reuse plan needs to beat the water problem first. So maybe startups could focus on coatings or mixes that keep cardboard from falling apart.

That clear pros and cons thing reminds me of my buddy last week, totally froze up.

Remember how finding that one issue you needed felt like a real win. Now with apps, you just tap and buy it, which kills the whole social barter system we had. Half the fun was the negotiation itself, not just getting the book. Makes a garage sale feel pretty quiet compared to the old swap meets.