Just look at what an investment in BioNTech would have done if you bought in October 2019:
https://www.google.com/finance/quote/BNTX:NASDAQ?window=5Y
You'd be 25x in less than 2 years.
How convenient for the Gates Foundation to invest $55 million in September 2019! https://investors.biontech.de/news-releases/news-release-det...
The chief innovation of mRNA vaccines is that instead of using expensive egg cultures, you can reproduce viral proteins inside the vaccinated patient themselves. This presumably means much cheaper manufacturing.
Additionally, you can drive long-term vaccine sales, since antibodies based on a single protein (spike) are more likely to fail compared to immunity based on the complete protein structure. We're already seeing this now with the 'need' for booster shots in response to variants driven by these leaky vaccines.
The most likely explanation is that the lab was engaging in risky scientific research, because they wanted to do ground-breaking science and were asking themselves whether they could, not whether they should.
Then they made a mistake, had a gap in the protocols, didn't follow them out of laziness, or some other accident, and infected themselves.
As attractive as such theories sound, pandemics are unpredictable enough that noone sane would start one to further some specific goal. At a large scale, there are rarely true winners in a pandemic (or war).
Coronaviruses have never been easy to contain. Not this one, nor any of the many other coronaviruses that have been endemic in humans for thousands of years.
We call the common cold common for a reason.