> hey, they also don't need tumblers

Yes they do need tumblers. Otherwise when they spend their undeclared crypto it is likely to be tracked by the government.

Where do they need tumblers for personal non industrial scale operations? I know ppl in South America who use crypto to save on dollar conversion fees when sending money abroad to family. No washing needed.

Where on the planet an oppressive gov somehow has the resources to track insignificant personal crypto amounts from ordinary people instead of just banning crypto? Check if crypto fuels this oppression machine in much larger amounts in the first place?