Lots of companies (big and small) don't unsubscribe me properly and I end up getting emails a year or two later. It's nice to have the nuclear options of deleting the alias if needed.
So yes, it's relatively minor compared to internet infrastructure products and tooling that Cloudflare is responsible for, but it's still an issue that erodes trust in a company.
[1] Detailed here: https://jonpurdy.com/2020/06/using-email-aliasing-to-detect-...