@loremipsum It's a service to make it easier for people in the Fediverse to follow certain tags.

It's harmless

@loremipsum https://tags.pub/ has all the information about it.

It's a global hashtag service that lets people follow hashtags from across the Fediverse. If you didn't enable it, your server admin probably did.

There's a GitHub repo at https://github.com/social-web-foundation/tags.pub

You can opt out using the NoTagsPub hashtag in your bio or just blocking the domain.