This is often somewhat true. However, as I have observed in several USA contexts, large organizations are often exempted (whether explicitly or not) from pesky new regulations, citing this very point. For example, I personally attended a California PUC meeting in which VZN and SBC were exempted from "lifeline" regulations that continued to be imposed (with nonzero costs) on the small CLEC that employed me. Large organizations have to keep lawyers and lobbyists employed, so they might as well keep them busy. Creating regulations and exempting themselves is common practice.
Perhaps things work differently in Europe.