Airbus forbids aerobatic manoeuvres in their RFM
but why? It isn't because the aircraft isn't capable, as FED points out, it is because when an untrained pilot tries it, messes it up and then crashes, the manufacturer would be liable.
Helicopters get abused in for more 'legal' ways than this - being flown constantly at high AUM, VNE, in turbulent conditions, all of which are non-reportable (all within the RFM) and all of which degrade the components quicker than the TBO stated by the manufacturer who will assume a wider spectrum of usage.