why is lobbying legal at all?

As i understand it, lobbying is a big part of politics in many countries. How is this not been banned yet? Why arnt people caring a out theese big corps. As their money seems to be worth more to politicians than regular folk.
Lobbying in the US is protected by the First Amendment of the Constitution, which enshrines "the right of the people peaceably to assemble, and to petition the government for a redress of grievances." [4] Any lobbying that is not explicit, quid pro quo bribery is legal. [1][2]
Although lobbying has often been criticized as bribery, lobbying is actually a legally protected practice in the United States. [1][4] Lobbying is often performed by organizations or groups, and the goal is to pressure the government into specific public policy actions. [1][3][4] This is often done by public campaigns and registering the campaigns with the government. [1][2][4][6] Lobbying is protected by the Constitution, particularly the right to petition the government. [2][3] Even though many people see lobbying as unethical, it is protected by our system of democracy. [6]