DJI drones fitted with grenade-dropping mechanisms have been used extensively and still see some use, but DIY FPV drones are now the preferred offensive weapon, used in a kamikaze role as a kind of cheap guided missile. They're cheaper, faster and more agile than the DJI drones. A good FPV pilot can hit the weak spots on a moving tank, or fly through a narrow opening to hit troops sheltering in a bunker. They're invariably used with DJI drones in hunter-killer teams, with a DJI drone acting as a spotter for an FPV pilot.
The sound of a DJI drone is known to everyone on the front line and it means exactly one thing - that you need to find hard cover now. If you can hear it, then chances are that it has spotted you, the pilot has passed on your coordinates and a kamikaze drone or an artillery shell is already flying towards you. If you ignore it or take pot shots at it, then you're gambling with your life.
https://www.youtube.com/watch?v=NjsemcB7I9o (subtitles available)
Urban radio environments are crowded, not actively hostile.
The issue with high energy jamming (broad frequency band denial) is it makes your jammer a super tempting (and easy) target for a HARM or equivalent, and consumes quite a bit of power. If someone is actively denying such a wide frequency band, any high school level electronics student can design a pretty effective seeker.
And the whole 'radio power drops off as a cube of the distance' thing means the equipment needs to be pretty close to operations, so it's going to get attacked pretty often.
The noise level in a typical urban environment from wifi is already pretty terrible, 'hostile' or not. Way more terrible than a typical remote environment, which is where these drones are being used, unless there are active countermeasures pretty close.
Counter measures, counter-counter measures, etc. But I'm not seeing much mention of effective jamming happening in-theatre right now.