Taxing online purchases is not a matter of if, but when. Governments don’t give up revenue. They have been and will continue to work on this problem until it is regulated into enforceable laws.
About 6-7 years ago, my state swept through small business to collect sales tax on unreported internet purchases. They made it retroactive for several years and collected a huge amount of money for the state. It became mandatory going forward. After each case was resolved, they sent a cute letter saying “we have forwarded this data to your city and parish(county) governments for their collection purposes”.