I thought… “Even if I get a patent, a big company can invalidate the patent with its large financial resources”.
The same argument can be said for security systems installed in your house. A determined thief can still overcome the security barriers, but the security system is a strong barrier and deterrent to a thief. He would rather attempt robbery in a house with no security system or a weak security system. Similarly, a strong patent is a barrier to would-be infringers. Without patent protection, a commercially successful invention would invite competitors to copy the invention without fear of any legal suit against them. It is not easy to invalidate a well-researched and well-drafted patent