I simply don't understand this part of your post. Why should someone farm testnet if he isn't a developer or something? Testnet is just a separate Blockchain for testing a new project. Or is there any other meaning to it I don't know of?
Yeah, you dey correct by your explanation of testnet but e dey type by type. E get some wey require some level of programming knowledge. Mainly nah debugging you go dey do and dey report errors, so that the project developer go fix the errors. While some of them no require programming language and anybody go fit participate. The tasks mainly nah just to connect your social media accounts and wallet and begin to dey bridge the test tokens from one chain to another and you go dey eligible to receive airdrop.