It's run by crypto/NFT weirdos. They promote "Gandi IDE" which is a modded version of Scratch that adds gamedev-specific functionality (mostly multiplayer focused). It looks pretty innocuous until you stumble upon this little whammy on their about page:

For those who don't know, DAO stands for "decentralized autonomous organization" and is a term for when a project is governed by blockchain stakeholders. The about page has a gif of someone clicking "mint NFT collection" and then a spinning Ethereum token pops up. Currently everything on their "asset marketplace" is free, but I wouldn't be surprised if they are planning to make it run on crypto. They're also marketing this to kids!
Please just use TurboWarp instead, and steer clear of "Scratch Game Jam".
Or PenguinMod is probably also cool? Idk, I haven't looked into it at all.