Congratulations!

But then, I have just no explanation then for how you can think of SaaS or blogging as "passive income".

Regarding SaaS, the second S is "service". You can't passively deliver a service. You need to keep it running and that means continual work. How you can see that as passive income baffles me.

Perhaps you're in a very fortunate position where you somehow convinced someone to do all the work and pay you money while you do nothing. Very very few people are so lucky.