The execution challenge for Remix is how to navigate the tension where FOSS and commercial forces pull them in opposite directions. So far, they've been stressing "interoperability", "no lock-in", "run it anywhere", etc. To live up to this goal, they'll need to maximize how portable Remix is, which will minimize the value of their specialized runtime service. Meanwhile, players like Vercel always positioned their products+services as a natural pairing, where the best stuff is inside the walled garden.