Do you feel the same about other wearable tech, like clothes and shoes?

Investigation, witnesses, gather evidence, build a case and present the evidence. Same as any other thing.

I don’t get why this would be harder to prove than other things?

If you don’t trust anyone the internet (or any net you don’t fully control yourself) is not something you will use.

Practical security is a matter of threat-modeling and calculated risks.

Mullvad has a good track record, but if you know of better alternatives that don’t require building it yourself, please share!

same way other regulations are enforced: fines

a worthy goal