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monero does not, but it’s users do manually. at least not too long ago it was recommended in the community

but we do use self custody wallets, which is actually a good thing. and we do churn, because the anonymity set of the sender (right?) is pretty limited as of now. and churning is almost like mixing between wallets.

what did Monero do to prevent it?

not everybody can install custom roms, either for compatibility, app selfblocking, or tech literacy reasons, or that they can’t afford to tuse a possibly unstable system (stability often varies by device and update)

serverside checks neither on federated services, or anywhere where the user chooses their server