DO NOT stoop down to their level.
What you are suggesting is wrong.
What is wrong with sending a message to a company whose policy is undermining freedom of speech in America? You would have told George Washington not to stoop to the level of the redcoats by taking up arms.
These same companies don’t pull their advertising from leftist programs whose talking heads use derogatory terms for conservatives.
Call them if you want or email them if you want and it may or may not get their attention. Or do what I suggest and they WILL get the message.