Although only certain countries have made this type of insurance mandatory, most industries, especially those that influence third parties such as visitors, trespassers, etc. Regardless of whether it is mandatory or not, most companies procure it to avoid unnecessary risk.
Certain small industries do not procure liability insurance policies as the premium is quite high, however, in the event of any claims, the legal costs will usually outweigh the premium costs. Therefore, procuring this policy is usually more prudent. This risk increases exponentially when these locations are shopping centres, theatres, clubs etc and areas where sporting events are held and places that allow consumption of alcohol. In cases where the risk is extremely high, policy providers either refuse to insure these liabilities or charge an exorbitant premium.