If the gross vehicle weight rating (vehicle weight plus payload) is over 4500 kg, it's exempt from the pedestrian safety regulations.
However, if it's over 3500 kg, special driver licensing is required, and commercial driving in it requires a tachograph, lower speed limits, and such. Basically, this thing will be extremely niche.
Worth noting that Tesla expects the Cybertruck to be Class 2b (8501 to 10,000 lbs, or 3856 to 4536 kg) and Class 3 (10,001 to 14,000 lbs, or 4536 to 6350 kg). Personally, I would be unsurprised if the Cybertruck that was shown last month is a North America-specific product, and the smaller Cybertruck is the actual European product (hence my comments about front structure design changes for pedestrian safety). If any full-size Cybertruck does come to Europe, I'd expect the RWD model to not come, as it's the one most likely to be under 4500 kg GVWR.