Although the web application has a notification but it is not a PWA, it is merely a package of the web application, opening the web page in an application's window, there are ads.
This application is not released by Microsoft Store but by third party named Pladoo Interative. However, it still works well and as a web application, there is no need to update much from Store. Pladoo said the application is part of the Windows Revival Project, which aims to bring applications to Windows 10 Mobile, based on PWA or the original application.
YouTube PWA download link on Microsoft Store https://www.microsoft.com/en-us/store/p/youtube-pwa/9pk8dxmxcm31
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