The answer
No. Payjoin is a collaborative transaction between payer and payee that can weaken common ownership heuristics. It does not automatically create a large anonymity set or guarantee anonymity.
What to do next
Compare the specific privacy property you need instead of choosing a tool solely from marketing descriptions.
BTCPay Server — Bitcoin checkout software
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BitBox Bitcoin hardware wallet
A Bitcoin self-custody device to compare; it does not make on-chain transactions anonymous or prevent address linking.
Explore BitBox Bitcoin hardware wallet ↗Official website; affiliate programme available to apply for. No tracked link or partner approval yet.