أحسن الله إليكم السلام عليكم ورحمة الله وبركاته Why isn't learning Islam online a bid'ah, as the Salaf never did this? جزاك الله خيرًا وبارك الله فيكم

This is a worldly affair not a worship in itself. There is no worship that is called learning online. The worship itself is learning islam whether from a book, screen, a person, etc.