iOS penalizes apps that abuse background privileges (running too frequently, running too long, being too resource hungry), so their background tasks get run les

iOS penalizes apps that abuse background privileges (running too frequently, running too long, being too resource hungry), so their background tasks get run less and less frequently over time. So at least on iOS, the impact of native junkware is limited to notification spam and can't run battery life into the ground as badly. It's not much worse than PWAs can do with webworkers and push notification permissions (and if someone has been granting every app push permissions, you can be sure they'll do the same for PWA push permissions).