I know nothing about Exoter, never even saw his name before this thread, but just because someone's business has failed does not mean they are not a good person, qualified, or unethical.
I know many, many good contractors that have closed up due to various reasons, many beyond their immediate control. Some simply because they were too nice and didn't charge enough, or didn't understand that there is a much higher cost to keep the doors open that the actual costs of work.
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