Manifold questions are resolved by their authors. Currently, Manifold gives full control over determining the correct resolution to their authors, although the admins do step in for markets that have been abandoned.

I proposed a system where authors still resolve markets, but there is a mechanism for others to dispute the resolution, in which case it is decided by the community or by admins somehow. I believe such disputes would be extremely rare. I think this keeps most of the benefits of author resolution, while removing the blatant misresolutions. This approach is discussed in more detail in 

Resolves N/A no such resolution dispute system is implemented by the end of 2023. If it is implemented, then I will make a poll asking "Do you judge this change a success?" Resolves to the average outcome in that poll, i.e. percentage of YES votes, or mean of numeric scores if I ask a numeric poll.