I must say this is a well intentioned proposal. Rewarding builders based on their activity can motivate them to create valuable products/ services for Arbitrum.
That said, with 500 million ARB, this is quite a financial strain :). The DAO has already funded many builders from the start to encourage new ideas to integrate with Arbitrum, and now we’re rewarding their success (which is great), but it feels like double funding 
I agree with other delegates, this could put selling pressure on ARB, leading to inflation and a decrease in ARB’s value.
Also, the $100K cost for a 2-3 month project with 6 people seems a bit high to me, to be honest.
I also think future airdrops should be forward looking, for example announcing them in advance and inviting builders to build, rather than rewarding past activity.
Not ready to say yes yet.