It's not only about BRC-20 which is usually under 1kb, people are inscribing much bigger files (https://www.ord.io/?contentType=video) at the moment for no apparent reason. I've almost never seen someone storing their NFT's collection files on Ethereum, but ORD community seems to encourage doing that on bitcoin and consider it innovative. I've seen one of the communities celebrate inscribing some of their used node_module packages on bitcoin a few hours ago.