That's exactly what a force majeure is. It depends on the specific contract and the jurisdiction whether a pandemic counts as one but it very well could.
Agreeing: If a pandemic isn't a force majeure then wtf is?
Perhaps if you signed up last week, then you could argue they should have foreseen the current situation from then. Prior to that, then it seems "best effort" is all one could or should expect. Perhaps with a monetary credit/refund if the mitigation is less costly than normal service.
