right, the key difference is that you need your project native token $GTC to mint a new $oneGTC, and when you pay in other stablecoins you have to give up on your token in exchange for that stablecoin. so If a community is incentivizing it’s ecosystem users to use it, you are driving another demand vector & token utility.
In a way it’s similar to how brands retain and engage user via loyalty programs, frequent flyer points etc - you encourage them to transact with your local medium of exchange to drive stickiness and retention of value within your ecosystem.