Wow, the Hong Kong Monetary Authority is backtracking to January 2023 for mainland account openings!? How does this affect us?

So, everything should be done early. If you want to open an account in Hong Kong now, you'll probably need to prepare a bunch of proof and sign a declaration of legitimate source of funds, making it very difficult to open.
The announcement states:
1️⃣ Backtracking suspicious / forged document account openings
Starting from January 2023, the focus is on "using suspicious or forged documents to open investment accounts," not a full fund review.
2️⃣ Clearing zero-balance and long-inactive investment accounts
If your investment account has no assets as of May 22, 2026, and there has been no customer activity in the past 12 months, it may be closed.
3️⃣ New investment accounts require a declaration of legitimate source of funds.
When opening a new account, you need to confirm in writing that the investment and settlement funds come from a legitimate source outside mainland China. This requirement has been confirmed by multiple media outlets, and HSBC, Hang Seng, Bank of China Hong Kong, and others have taken related actions.
What is the impact on users who already have accounts in Hong Kong? What do they need to prepare? What should they pay attention to?
Currently, there doesn't seem to be any major impact, but if you want to activate new investment features in the future, you may still need to follow these requirements.
Also, I don't know if I might be randomly checked; it feels like the regulations are getting stricter.
I think it's better to prepare these things in advance.
1) ID proof, address proof, account opening documents;
2) Hong Kong / overseas bank statements;
3) Proof of income from salary, business, dividends, investment returns, asset sales, etc.;
4) Tax records, contracts, transfer receipts;
5) All deposit sources, try to ensure "same-name accounts, clear sources, complete vouchers."