Just a quick reminder to users: if you see spam, simply commenting "spam" or downvoting it doesn't alert the mods. It's best to hit the report button and/or comment directly mentioning the mods of the community or the admins of the instance where the post originates from.
If you report the offending post to the admins of another instance (Lemmy.ml sees this a lot since we one of the biggest instances), they can only remove and ban on their own instance, whereas the home instance admins can ban the user from posting at all, and if they remove it, it should propagate through to the federated instances.