Has Paypal suddenly started charging sales tax?

Is this new, even for interstate purchases, and even between private parties?
Does it apply just to Paypal Invoices?
Has anyone experienced this?
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I haven’t sold anything for awhile but when I placed an ad in classifieds, I had to link my PayPal account to Audiogon and register as a PayPal Merchant. And PayPal is now referring to me as a merchant.

What’s all this then?


The Paypal document refers to sales tax with respect to retailers and what is required from them per law per the Nexus crriteria  If you are selling your own used gear this doesn’t apply unless you set yourself up as a company

I don't understand. Is everybody that's accepting PayPal for a sale called a merchant even though most hobbyists are not doing it for profit?