I also have an @ alias on my domains, and give unique addreses to companies/services which identifies them. I'm only had a couple accusations of "fraud", but they were easily dispelled by asking them to explain what "fraud" I was committing (they couldn't) and explaining why I do this.
Addresses which have been lost/stolen and start receiving spam become spam traps, and I change the email address with the company/service to a new alias so their legitimate mail is delivered normally.
In some of the few cases where the loss/theft was identified, it didn't happen at company/service directly, but with one of their suppliers, for example, a breach at the marketing email provider they used.
Addresses which have been lost/stolen and start receiving spam become spam traps, and I change the email address with the company/service to a new alias so their legitimate mail is delivered normally.
In some of the few cases where the loss/theft was identified, it didn't happen at company/service directly, but with one of their suppliers, for example, a breach at the marketing email provider they used.