> Developers and miners can't force users to switch to another version. Miners can, but it’s costly. By a majority mining empty blocks on the chain they wish u

> Developers and miners can't force users to switch to another version. Miners can, but it’s costly. By a majority mining empty blocks on the chain they wish users to switch away from they make that chain useless. However, they need to sacrifice profit on some other chain (by not mining on that) to do so.