You can make this same, tired, ultimately invalid argument about anything you look to improve.
You can’t prevent the spread of all communicable disease, so why bother taking any precautions?
Someone could build their own gun, so why bother preventing a convicted felon from buying an oozie?
Someone could evade a line item tax by hiring a fancy lawyer and setting up bespoke legal structures around themselves as an entity, so why bother looking at closing any of the existing tax loopholes?
The answer is that because it’s not fucking all or nothing. Sure, someone could hypothetically do lots of things to evade any precaution that you put in place around dangerous or bad things, but that doesn’t mean it’s completely ineffective. If it’s too much of a hassle, some people won’t bother. Some people will actually get caught. Hell, with the existing lax corruption laws and lazy ass enforcement in the US people are still sometimes found in violation of them.
It isn’t a “if you ain’t first you’re last” situation. Reasonable safeguards, laws, standards, practices, and the like save and improve lives.