Does a tech speaker have the ability to influence legislation or rule in a hearing about the company that is paying them to speak? If so, and if they don't rec

Does a tech speaker have the ability to influence legislation or rule in a hearing about the company that is paying them to speak? If so, and if they don't recuse themselves, there would indeed be a problem. Fortunately, tech speakers don't have anywhere near that kind of direct power. If company y pays the manager in charge of purchasing at company x $600,000 to speak, then they bid on contracts with company x, there would also be a problem.