"Not a user but..."

From my quick 10mins research. Privacy on Base done properly. That's basically what Veil Cash is aiming for. Uses zk-SNARKs to let you send and receive ETH and USDC privately, non-custodial, but with a twist. Access is restricted to verified users through compliance screening which keeps the privacy pools clean and separates it from the typical mixer stigma. Backed by Coinbase Ventures, audited by CertiK, open source on GitHub. For a privacy protocol those are reasonable credentials to have. Again. Not something I personally use. No major red flags or controversies from what I can see but privacy protocols carry their own risks by nature so always worth doing your own research before jumping in.