And why not? Did you read Biden's gun plans when he was running for President? I did.
He wanted all gun owners to have to get a federal license to own the guns they've owned for years or even generations. He wanted to force every gun owner to have a psychological exam at your cost of $800.00. Some anti-gun shrink would interview you, your employer, your coworkers, your neighbors, your ex-wife, everybody. Then he would make a determination as to whether you could own a gun or not based on their answers.
Mind you Dementia never carried through with his plans, but the Congress did try to pass his measures. That's why you don't want the federal government to know about your guns. If he got his way, you would be getting a notice that you must get this federal license for the guns you legally own, or else.........