There are a few reasons really. Unless otherwise specified, everything in the shop is washed prior to shipping. The process generally is to photograph each item, launder them then sell and ship. All items are machine washable and dryable.
Right now, reason #1 is because of the Covid 19 virus.
Reason #2 is so that when you the customer, wash your purchase for the first time, there are no surprises for you in regard to fabric shrinkage, stretching, general flaws or fading etc.
Reason #3 is there are pets in my home and I do my level best to make sure each and every time is free of airborne particles and also lint. Smalls, such as lanyards etc are not washed but are contained for a long duration prior to sale.