This is a follow-up from our Spam-label approach, but this time with MOAR EMOJIS because that's what the world is turning into.
Since March 2023 projects could apply the "Spam" label on any new issue and have a magic bot come in and purge the user account plus all issues they've filed, see the earlier post for details. This works quite well and gives every project member the ability to quickly purge spam. Alas, pesky spammers are using other approaches to trick google into indexing their pork  (because at this point I think all this crap is just SEO spam anyway). Such as commenting on issues and merge requests. We can't apply labels to comments, so we found a way to work around that: emojis!
In GitLab you can add "reactions" to issue/merge request/snippet comments and in recent GitLab versions you can register for a webhook to be notified when that happens. So what we've added to the gitlab.freedesktop.org instance is support for the :do_not_litter: (🚯) emoji  - if you set that on an comment the author of said comment will be blocked and the comment content will be removed. After some safety checks of course, so you can't just go around blocking everyone by shotgunning emojis into gitlab. Unlike the "Spam" label this does not currently work recursively so it's best to report the user so admins can purge them properly - ideally before setting the emoji so the abuse report contains the actual spam comment instead of the redacted one. Also note that there is a 30 second grace period to quickly undo the emoji if you happen to set it accidentally.
Note that for purging issues, the "Spam" label is still required, the emojis only work for comments.
 or pork-ish
 Benjamin wanted to use :poop: but there's a chance that may get used for expressing disagreement with the comment in question