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Certification requires testing in a specialized lab that has a special anechoic chamber along with equipment that runs tens of thousands to hundreds of thousands of dollars. You also need an engineer or highly trained technician to run the test and/or interpret the results. You also have to wire up and instrument every device that comes in and they do vary a little. That's why the cost is in the thousands of dollars. There is a profit margin for the labs but it's also not a cheap service.

It is not efficient policing bad devices after the fact. You can have a bad device interfere with RF communications for miles. It then requires dispatching a team of humans with RF probing equipment and escalating to the Feds if the person refuses to comply. It does happen but it is time consuming.

Leaky RF can cause mass events such as https://www.cbc.ca/news/canada/calgary/carstairs-westview-co...

Here's a IEEE Video on the process of interference hunting: https://www.youtube.com/watch?v=elUDfDmIHLs

A short article on how some equipment on a tug boat was interfering with a town: https://www.verizon.com/about/news/verizon-test-force-braves...

And this is the interference hunting that has to happen now with devices certified. It would be an absolute hell if devices could just be introduced willynilly.

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