As commented above, as long as 

- it's a one-off thing
- there's explicit disclosure
- the answer is a good quality one and stands on it's own


then I don't think there's a need to remove the referral link. If the referral link is the only thing that's being blasted across - then you know [where & how to make use of the spam flag][1].


  [1]: https://meta.stackexchange.com/a/58035/133693