BS. That was sales tax and Amazon collected it directly on checkout. It was no hassle at all.
No. Look it up. They didn't collect state sales tax for years. For example they started collecting CA state sales tax in 2012.
States argued that (if Amazon had a physical presence in the state) but this was disputed because it violates the interstate commerce clause and the States only got their way by getting Amazon to deduct the taxes.
We are not talking about an ambiguous issue like that. The IRS has made it very clear what the culpability is.