It should also be noted that even in the US, the bastion of economic liberalism and extreme capitalism, only 15% of all families own stock[1].
Also, it was reported a couple off days ago that 89% of all stock are owned by only 10% of americans[2]. So, Bill Gates owning stock is not relevant or meaningful.
Lastly, Bill Gates at most invested 55 million on BioNTech[3]. We're talking about a guy whose fortune is evaluated at around 135 BILLION dollars. To put things in perspective, this is equivalent to a guy who has $1 million investing $350 on a company. Come on.
[1] https://www.forbes.com/sites/teresaghilarducci/2020/08/31/mo...
[2] https://www.cnbc.com/2021/10/18/the-wealthiest-10percent-of-...
[3] https://investors.biontech.de/news-releases/news-release-det...
It makes sense that vaccine producers would be popular companies during two years of pandemic.