So how exactly are they going to police collection from foreign sellers ?
Marketplaces like eBay will automatically collect VAT, based of shipping address.
About a year ago they implemented similar thing for sales tax collection if the US:
Let say I’ve sold used lens on eBay for $2,000, and the buyer is in Kirkland, WA. The buyer will be charged $2,204. Of those, $130 is collected Washington state sales tax, $0 is King county sales tax, and $74 - Kirkland city state tax.
I, as a seller, after being ripped of by eBay and PayPal, will get $2,000 less $220.40 eBay final fee (yes, they compute final value fee on tax too), other eBay fees if any (placement fee, various marketing fees, purchase of discount shipping labels, etc), and $64.22 PayPal fee (they charge PayPal fees taxes too).
So at the end:
Buyer pays $2,204
Seller gets not more than $1,715.38 into their PayPal account
WA revenue office gets $130 directly from eBay
Kirkland city gets $74 directly from eBay
PayPal pockets $64.22
eBay rips off the seller $220.40+
As a seller, there is no way to evade sales taxes