They have to. As long as there are remaining covid19 cases in a country, they have to be careful reopening places where people can gather. There's an option by implementing a strict protocol of physical distancing.
But IIRC, one hot case in South Korea came all from one woman who attended different churches praying for healing as she founds out to have the symptoms of the disease yet little did she know, she infected a lot.
Makes sense, this is something that they're dealing with as an issue in the states too. As it's very tough to tell people that they're unable to go back to their churches, as for many that is really their only sense of community (and it is obviously important as a religion to them too.)
Some states are enforcing strict social distancing in churches, clean up crews, and so on. That should be something that should be done in areas where health officials deem it possible.
Services being done outside, online, etc will all be able to work in helping people continue their faith during an especially troubling time like this.