It seems to me that for applications other than food/beverage containers there's probably not an issue as long as it isn't used to create a throw away product b

It seems to me that for applications other than food/beverage containers there's probably not an issue as long as it isn't used to create a throw away product by replacing more durable materials. Synthetic fabrics could be an issue due to micro-plastics; however, unfortunately there just aren't good alternatives for many applications; particularly for vegans. For example, for cold weather gear you basically have synthetics or wool. For rain gear the only non-synthetic options that I can think of are leather, oil-skin, and waxed cotton.