Yes, but I should probably also put one up on my other domains

No, because it invites beg bounties and slop reports.

No, it's free real estate for scams, slop and the like.

Nope, maybe I should ! Thanks for the reminder !

I do, but with a few tweaks that cut most of the junk the other comments mention:

• Point Contact: at a dedicated alias, not your main inbox, and filter it hard. If the noise gets bad you can drop the alias without touching anything else.
• Add a Policy: line linking to a short page that says plainly there is no bug bounty and no payment for reports. Most beg-bounty mails are mass-sent with a payment ask, so this gives you something to point them at and lets you bin them without guilt.
• Don't forget Expires:, it's actually required by RFC 9116 and a lot of hand-written files leave it out. Set a calendar reminder to bump it.
• Serve it at /.well-known/security.txt; the root path is only a legacy fallback.

Whether it's worth it for a homelab is debatable, but if you host anything other people rely on (a Matrix/Lemmy instance, a shared Nextcloud), having one real contact path beats someone finding a hole and having nowhere to send it.

Do people actually contact you with that?

Nope.

Why so people ignore that too?