I guess, if the start asking, expect them to close your account in the end regardless. It feels like they are more looking for reason to keep your money for longer and keeping at least some of their reputation. I can imagine even if you would have bullet-proof documents, they will still close your account. I guess they need to de-risk as good as possible, either to make money at all, or to make more money from small non-risk clients. Their risk might be more being ask questions by the authorities, regardless if they have good answers. It's just expensive for them to have to handle those questions at all.
I think TW prefers small residents with a turnover of 5 digits per year, not more. You know those the have a proper job ...
Read their TnC:
You may not use our Services ...
- for anything that ... does not comply with our content standards ...
- in any way that would locally or internationally evade any applicable taxes or facilitate tax evasion
... exceeds our risk tolerance. ...