I have mentioned /aztec on many occasions and now they are closing in on mainnet I do believe they will gate onboarding with some form of identity verification.

A couple of existing tools that could be used

1) On chain KYC attestation, such as Kraken verify - already around 10K verified addresses https://inkonchain.com/verify
2) Direct deposit from a regulated exchange
3) Direct fiat onboarding via bank/cc - give a fee rebate to users
4) Throttle but allow the address already connected to CEX
5) existing on-chain KYC/POH platform like ZKpassport https://zkpassport.id/

Privacy and OSS are major pillars of Ethereum, and I am rooting for aztec

Even more certain that Aztec will gate onboarding to some extent with KYC. 
ZKpassport is open source and can be integrated with existing wallets. It shares only the required information, and identity data is stored locally on your mobile. Verifying identity takes less than 5 min. 
one example -
user can deposit up to 10K per wallet to a LP pool but beyond that they need to verify their identity.

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1/3 Age verification online usually means giving up personal info, but it doesn’t have to.

@ZKPassport uses zero-knowledge proofs to let users prove they're over a certain age without revealing their birthdate, name, or any personal data.

https://t.co/drEHgI9hQK

Aztec

Even more certain that Aztec will gate onboarding to some extent with KYC. 
ZKpassport is open source and can be integrated with existing wallets. It shares only the required information, and identity data is stored locally on your mobile. Verifying identity takes less than 5 min. 
one example -
user can deposit up to 10K per wallet to a LP pool but beyond that they need to verify their identity. 
https://x.com/aztecnetwork/status/1938315968477802808