@quid Thanks for the response! What about a post on meta.

Is it better make a post on meta about this? (So that users are aware of this and they know what to do - even if this answer is simply to edit the posts they find and flag the comments they find.)

Or is it better not to make a post on meta? (So that mods are not flooded with flags about this issue.

Of course, the post on meta can be made a bit later, since the mods seem to be busy right now. (Resolving conflicts, starting sponsors' lounge, updating "How to ask?". Even I made recently some suggestions on meta which will need help from mods at some point - search faq, stats on "Hot to ask?".)

I have also tried this: chat.stackexchange.com/transcript/88939/2019/1/29 Maybe I'll list also some specific examples there, but so far I have tried to created some SEDE queries which might be useful.

A chatroom would be a possible way how some users might become aware of this problem and help with editing/flagging - and this would be less noticeable than post on meta, so less likely to cause too many flags at the same time.

I'll try to get back to this later when I have more time.

I'd say that \newcommand made on many occasions writing posts much easier (faster) for me. I have to say I consider it useful.

Of course, it would be possible to save a copy with newcommand locally on my computer and post a version which is expanded. But I do not know a software which expands macros in such way.

Some related posts on TeX Stack Exchange: Is there a script that reads a TeX file and replaces every instance of a \newcommand? and LaTeX macro expander. (I might try to search for more similar posts later.)

Hmm, I have forgotten again about the powers of dupehammer. In cases which are not clear cut, I should probably only cast the final fifth reopen vote in such tags.