You can bet that countermeasures are already in place or are being developed now. Jamming of commercial drones is doable. However, it is ridiculously hard to jam software controlled radio equipment. Especially military grade hardware. SpaceX demonstrated this recently when they got past Russia's top of the line hardware. The energy requirements balloon to ridiculous levels when you are talking about broad spectrum jammers doing area denial. In addition, such jammers make excellent targets since you know exactly where they are. If drones could be targeted it makes jamming a lot easier, but still difficult.

One thing we can expect is home on signal anti-aircraft batteries and anti-loitering munitions that seek other loitering munitions. I wouldn't be surprised if this is one of the last big wars where such COTS drone tactics are successful.