if you have a big capital it will be easier to generate passive income but if the passive income we get from businesses that still needs a lot of our intervention, I think it's not a good idea. I prefer to invest in rental property because it was more practical.
I believe there are a lot of real time opportunities to generate passive income with lot of capital amount when compared to online opportunities. We could not find many legit opportunities online even we will be ready to invest very big capital amounts. Based on a rental trend in your country, you can earn handsome by renting out properties.
the one thing that i know to have passive income by online is we make a website, maintain it, make a link with other sites, have a product or good article in our website, join as publisher, then we can have passive income as our source to make money. but the challenge is really hard, because we need to maintain our website and stay focus with the site.
I've made a lot of many niche sites. but almost all of my sites was rejected by google adsense. I was desperate for it. but you can use other advertising such as bitmedia, sitti, and many other ppc, but the rate is not as big as adsense