Who is Etsy's best competitor?

Can you tell me who Etsy's most formidable competitor is in the online marketplace for handmade and vintage goods? I'm interested in understanding the competitive landscape and identifying the key player that poses the greatest challenge to Etsy's dominance in this niche. Is it a well-established rival with a strong brand presence, or a newer entrant leveraging innovative technology to disrupt the market? I'd like to gain insights into their business model, market share, and any unique selling points that set them apart from Etsy.