My day job means I have to contact directors across Europe via their landline, mobile and email - since GDPR very few (less than 10) have asked where I got their details from. My standard response is...."My research team found your details online" and then I move on. Even when they might not be interested, no one has asked me to remove their details from our database.
With my outbound for domains I send an initial email and have had ZERO replies regarding GDPR -
Big fuss about nothing if you ask me!