Organizations that care about leaking information encrypt their identifiers as UUIDs. UUIDs conveniently have the same size as a single AES block, for which the

Organizations that care about leaking information encrypt their identifiers as UUIDs. UUIDs conveniently have the same size as a single AES block, for which there is dedicated silicon on all modern CPUs. There is almost no overhead. Every other issue with random UUIDs etc, which are ignored here, are solved by encrypting your identifier. Random UUIDs (i.e. UUIDv4) are banned in many places for good reasons.