> If they can show that the majority of users are committing crimes with the app, that's a much stronger case than just rounding up a handful of witnesses.

I still don't understand why this should even be relevant in cases like this. The thing is basically a generic OBD dongle, right? The same thing every DIY and shade tree mechanic uses to read codes and run service procedures.

Suppose 20,000 people buy it and use it for defeating emissions. Some other number of people buy it for the normal thing. Why does it matter at all whether the other number is 50 or 50 million? Those are the people who aren't relevant. Should the OEM be in trouble if some unrelated third party happens to write the emissions defeat code to require their dongle in particular so they have a high proportion of customers using it for that? Should they get away with promoting it for that if they're a huge company with lots of sales to people not using it for that? None of that should matter. The seller doesn't even control what the users are doing with it, nor should they.

If there is a law against advertising it for defeating emissions then prosecute them for the advertising. That's their crime, what the customers do is third party action.

> I still don't understand why this should even be relevant in cases like this. The thing is basically a generic OBD dongle, right? The same thing every DIY and shade tree mechanic uses to read codes and run service procedures.

The difference is this company provides a bunch of cloud services to roll out specific tunes at scale.

From the original filing:

> "EZ Lynk worked with/previewed the EZ Lynk System for at least two delete tune creators during development and before launching the EZ Lynk System. Those creators later disseminated delete tunes using the EZ Lynk System. There were numerous social media websites, including the “EZ Lynk Forum,” where third parties discussed using the EZ Lynk System to defeat emission controls. The Forum was run by EZ Lynk and one of the delete tune creators EZ Lynk worked with during development, and it provided contact information for EZ Lynk technical support. EZ Lynk representatives interacted with posts and videos about deleting emission controls and installing delete tunes, including tunes from one of the delete tune creators EZ Lynk worked with during development."

So it does seem like the DOJ is going after them for collaborating on developing and enabling the tunes. I suspect the subpoena is about establishing damages.

> The same thing every DIY and shade tree mechanic uses to read codes and run service procedures.

Now you have me wondering if this is their real target, to go after people who are defeating CRM on their vehicles so they can repair them themselves or in their small mom-and-pop garage of choice. But right to repair is popular, so they have to claim it's for something else.