For those building and creating new ideas, @ethereum testnets serves as a sandbox that encourages experimentation at low cost without messing up provenance. At its best, testnet support at the platform level also serves as a gentlemen's agreement between the leading platforms and their users to uphold the composability and permissionless properties of the blockchain for builders and creators. Even though testnet support comes with additional development and maintenance costs, and as a small company @manifoldxyz trust us we totally feel the brunt of this, we've always thought it was worth it to make testnet support possible as it aligns with the ethos of ETH and contributing to an ecosystem larger than what we could do alone. Just our 2 gwei.