Virtual Mailbox vs. Lawyer for Incorporating

I'd be more curious as to whether you will need a lawyer for anything else in your business in the future?

If you plan to make a one-man SASS product you might be able to get by without one, and maybe the mailbox makes sense. But if you plan to build a real company (with employees, terms of service, contracts, legal counsel to avoid getting sued, etc.) you're going to need a healthy relationship with a lawyer anyway, so why not start one now?

If it's a SaaS, you better incorporate in HK and you'll have zero taxes if you blacklist local (HK) market. It is also fully stripe compatible. It would also shield you from problems.