Thailand has been clamping down on tourist visa abuse lately and working there in any capacity, even if your business is entirely online and outside Thailand is illegal. You might get away with it but you're definitely taking your chances. Getting a proper work permit there is quite expensive and difficult.
Cambodia and Vietnam are much laxer in this regard but also don't offer the same standard of living.
Cambodia and Vietnam are much laxer in this regard but also don't offer the same standard of living.