I'm not sure this is true as presented. I agree less and less people run their own sites. But I don't know if this is because customers prefer platforms for cyb

I'm not sure this is true as presented. I agree less and less people run their own sites. But I don't know if this is because customers prefer platforms for cyber security reasons, or if it's also a value proposition for sellers (e.g. not having the headache of keeping a site running so you can focus on selling). For hobbyist materials, eBay is still great. For bespoke goods, Etsy is unbeatable and you can even build relationships with the sellers.