Meshtastic works on commercial frequencies. If they block those then a good number of non-wifi/bluetooth devices will just stop working.
Including, but not limited to: garage door openers, some (older) car key fobs, some RC equipment, wireless weather sensors, remotely readable metering devices (electricity, water) and a crapton of other things.
You could just flood Meshtastic channel with valid traffic specifically
All Semtech LoRa modems are wide-range modems. You can switch to basically every other frequency.
An idea would be to move to SX128x modems with work around 2.4GHz. You recycle Wifi-gear for directional stuff. This also enabled you to hide below Wifi traffic.
Still jammable - but much much more difficult.