Description of the need When anonymous users are set to post comments, then additional configuration settings for anonymous commenting appear on the content type settings. Two of them allow anonymous authors to leave links to their homepages.
In most cases the field is abused by spammers who put ad links in that field. Despite it is possible to easily hide or remove the field using template overrides, I believe this field should be properly changed in core.
Proposed solution I would completely remove the field, however considering those rare websites which need visitors to leave their homepage links, we could make this configurable just in the same way as the comment titles are allowed or not like shown on the screenshot for proposed change.

Recent comments
The simple way is - View source code - Copy and paste what you need - Bold can be easily added with <b> or <strong> tags
Use text editors in Summary Field
I have had a read of what Lando provides, and it's an excellent development tool, and it would solve the problem. But, I would prefer to find out why the problem is there in the first...
How often is the settings.php loaded.
Thanks for the info. I will give it a try...
How often is the settings.php loaded.