Teams Channel with special charcters

Question

We all know including these characters ( ~ # % & * { } + / \ : < > ? | ‘ ” ) in teams channel name of the teams' name can cause unknown issues with graph API.

we have faced some using the file Folder API in the channel.
GET https://graph.microsoft.com/v1.0/teams/{id}/channels/{id}/filesFolder

when the channel name had the '&' symbol

The “&” symbol in the channel names seemed to be the common denominator. I have removed this symbol and can now load the channels via the API and call the files API successfully.

I have the following questions to ask.

1. Why are lots of other channels able to have the & symbol in them with seemingly no issues?
2. What will happen to my other sites with the & symbol in their channel names?
3. Can your developers restrict people’s ability to rename the channel using the & symbol?