With completely wireless earbuds, the rule is: when the battery fails, they have to be disposed of. Not so with the Fairbuds, that allow you to replace batteries in just a few seconds. Combined with a repairable design, the earbuds should therefore have an extremely long lifetime.
They proclaim to value open source and it seems they’ve tried to do some stuff in the past. I think software freedom is a natural conclusion of hardware repairability but it seems their priority is instead on being green and workers up the chain getting a fair pay.