It has been announced that support for the YouTube app on Nintendo 3DS will come to an end in September.

The news doesn’t come as a particular surprise, given that the YouTube application is outdated and prone to repeatedly crashing.

“The YouTube app will no longer be available for download after 12:00 CEST on 02/09/2019,” the company confirmed in SpotPass notification distributed to the handheld.

“Additionally, from 03/09/2019, you will no longer be able to use this application.

“You can still use YouTube via the internet browser on the following systems if you enable ‘Use mobile versions’ setting: New Nintendo 3DS, New Nintendo 3DS XL, New Nintendo 2DS, and New Nintendo 2DS XL. We apologize for the inconvenience.
The article makes it seem like Nintendo is the one ending support for the YouTube app but I'd be willing to bet that it's actually Google that's killing off the app and Nintendo just released this press release as a way of notifying their customers. After all, Google likes to kill things off and it wasn't all that long ago that they killed off the YouTube app for the Nintendo Wii.