[tornato7]

If it's running on Ethereum then users will see $5-20 transaction fees and >20 second transaction times. That's not a great experience for first time users

[fbrusch]

It is now possible to use so called layer 2 (L2) solutions like zkrollups, considerably reducing fees and increasing throughput (https://vitalik.ca/general/2021/01/05/rollup.html). Loopring is already functioning on mainnet. (https://loopring.org)