They are not sabotaging "web apps" (aka websites), you just need to save the website to the homescreen if you want to use a web app, (this is both quicker and takes up less storage on your device so it is better for the end-user).
They are removing these "apps" from the appstore because they are not native apps.
Yes because what they are doing is just removing websites from the app-store. Other app-stores might add those websites to their store if they want but for the user it is almost always better to just save the website to their homescreen, which gives the exact same UX as previous web-apps but now you don't need to go to the app-store to download it, the app takes up no storage on your device and the web app can't access your privacy sensitive device IDs that might be used for cross-app tracking.