That's not really the point, though. A strike works because the strikers are willing to lose their pay to force action. If the strikers can be replaced, then the strikers lose.
What you're saying is true: the strikers in this case have nothing to lose.... except their partial control of Reddit. And Reddit will gladly take that from them.
Once the subs are reopened, any ongoing strike will amount to angry people with no power shouting into the void.