One of the more interesting features of the Switch 2 will require a user’s phone number to be linked to their Nintendo account to mitigate potential abuse. That’s right, to use the GameChat service you’ll need to have a valid phone number.
This feature–which requires a lot of the system’s RAM–kinda annoys me since I’ll probably never use it, but it’s taking up valuable system resources that could be used for other things. The fact it seems like a slight pain to setup just makes it more annoying. This is in addition to the thing being choppy and only running at a slow frame rate.
Nintendo: please let users disable GameChat to improve game performance if they want to. That is all.
(Source).