Let's be honest here: remote and in-person is a major tradeoff with significant pros and cons on both sides. Remote work increases your talent pool by 5 orders of magnitude and removes commute overhead, but in-person work increases your communication bandwidth and team cohesion in similarly dramatic ways. Hybrid solutions put a hard cap on the upside of either path and therefore tend to give you the worst of both worlds. It makes perfect sense to be opinionated about this, especially at the startup stage. I respect the decisiveness (even though I would be very reluctant to go back to full-time commute).
Also in person is a good filter if you are getting too many applications, which I am sure this will assuming the pay is good (but those $100 bounties implies maybe not - anyone who could do those in say 15 minutes would be worth more than $400/h)
Let's say that you are someone with a dedicated drive to contribute to AI, with the ability to grasp the complex program space, and spend many hours figuring out the solution to the problem. I.E the perfect tinygrad candidate.
There is a high chance that you are probably neurodivergent to some extent.
So instead of WFH, where you can remove distractions and work on your own time, you are now forced to abide by someone else's schedule, take time commuting, e.t.c
In office work is for people/positions that require hands on work with hardware, or you are hiring for replaceable positions where people don't have dedication to the cause and are going to do as little work as possible for the same pay. Tinygrad is neither.