That's just three random examples. Foreign investment allows companies to grow and succeed. I think there's sensitivity in this area due to past history though I don't think it's fair in this case. Owning a foreign company isn't 'exploitative.'
The issue isn't about a few foreign companies. Is the majority of Canadian market cap foreign?
You are comparing apples and oranges. In many cases larger countries are able to conduct fair trade agreements. In the case of smaller countries they usually don't have the resources (military/political influence) to enact fair agreements and are "ripped off" by companies offering jobs.
This doesn't really matter, because holding companies are in their simplest form empty shells that merely hold shares of other operating entities. They group equity participations. You want a holding company to be based in a country with an established and stable legal system, of which the African continent has exactly none.
Jumia is for all intents and purposes, an Africa focused group.