Almost any business can be represented on the Internet. Relevant new professions and places that do not require much from entrepreneurs, trade or management experience.
Yes, you can promote any business online today. Online business has global market. If you can do some SEO on your site / products, you can sell off pretty well!
Nepal https://chatsansar.com
I think the OP is right when he says that there is a scope for any business to be promoted on internet but at the same time it's also a fact that one has to know what site attracts best business according to their niche. I have seen businesses getting no response because they were promoted on wrong site but at the same time some items like stinking inner-wears were sold like hotcakes just because they were promoted on write sites which attracted tons of takers.