[uecker]

The website / service you want to use will not accept your key, but only the key from the organization that makes sure that your software does not make it possible to skip the ads. So I think the only chance to avoid this is to reject such concepts completely from the beginning.

[Chris2048]

You can always build/compile your own software, having the local 'key' is the ability to do so. I'm not sure what else is implied - how will an external service / website enforce this?

[uecker]

Via remote attestation.