Why would anybody edit my answer to change links to cppreference
To improve your answer. That's why people edit. They try to improve the content they see. You can throw all your "opinion pushing" - or whatever other interpretation you like - at it, the fact is that the user who edited your answer tried to be helpful.
As has been discussed in an earlier Meta post there are those within the C++ community who don't think highly of the information provided by cplusplus.com.
Imagine cplusplus.com is my favorite cpp reference. Why would anybody edit the link another reference?
With some of the concerns expressed in that question, the matter of a "favourite" reference moves away from favouritism, and goes towards reliability and correctness. And that would answer your question. Why would they change it? Again, to improve the content. Adding a more reliable resource is of course always welcome.
Now, if you disagree with the idea that one resource is better than the other, or that your favourite has significant flaws, by all means go and express that in the other question. State your case and the community can have a look. Or if you don't see where your favourite is flawed, by all means ask them what the problem really is. (Or perhaps you can even ask that in the C++ Lounge chat, if they welcome such questions. I don't really know).
But in general, editing is done to improve content. And without any clear malicious intent, all we can assume is that the editor is trying to be helpful, and they should be thanked for it. Still think the edit is not a good one? Then roll it back. That's all.
