Wem gehört der Titel eines Themas?

I think the answer is “it depends on your community.”

The Discourse philosophy is that trusted members of the community help curate the space – pick up trash via flags, organize topics and categories via TL3 editing, put up helpful clarifying signs in the site feedback category, etc.

The general idea is that the community helps organize itself. If this isn’t what you want, there are site settings as @falco noted:

trusted users can edit others

Allow users with high trust levels to edit content from other users

That one is specific to editing, so it would disable the TL3 ability to edit topic title and category.

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I really wish “Regulars can change titles” was off by default. I’ve had posts edited for silly things, and it messes with my SEO!

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You can change this setting.

trusted users can edit others

Personally I haven’t had a problem. Sounds like a site issue not something that should be disabled by default on all communities.

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Yes I know it’s a setting lol. Agree to disagree on what the default should be.

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What are you doing? Is the SEO so important to your forum? Did you try to talk to your regulars- they might be unaware of the problem.
I still cringe if I have to read trough a longer thread/topic finding out that it already was closed or totally misplaced by category and title.

In the end the rigor of the answer of the owner reduced my activity in the forum quite a bit in the last six month. Do not forget regular contributors might be what is a worth you can not easily replace

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