Sham volunteer visa is same as having a page saying you are a refuge with covid, aids and cancer and have no money. Odds of reentering would be higher as a refuge then with a volunteer visa now.
no in most cases. Exceptions are it’s BoI ( Board of Investment ) or you have a foreign business license.
Certain categories any nationality can own as a 99.99% foreign owner as you are not competing against Thais. Such as exporting, manufacturing ( restricted to not with ice making or guns ) and if you then export 100% what you mfg.