Etsy
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Account suspension without a reason
Signed up for a second time with different email as they suspended first registration after letting me buy a product and then shut me out completely demanding a huge amount of personal information which I was not willing to give. Fortunately item arrived. This time I found product, was messaging seller when they permanently suspended account demanding loads of personal information again. Fortunately I managed to track seller on-line and completed transaction directly with them. In all my years, and there's a few, I've never come across such a thing. Seem to be a weird invasive company.