Your time is valuable -- invaluable, actually, since time is the one thing we can't buy or create -- and you have the absolute right (and responsibility) to use it in pursuits you support. So to "answer" your "question" posed at the end of your post -- the past, present, and future of any company or entity you provide your time (and money, for that matter) to is as relevant or irrelevant as you want it to be.
The reality of the world is that, unfortunately, any company that has been around for any length of time will likely have been a party to something objectionable. This is true for all of the major US companies, European companies, Chinese companies, Russian companies, etc. etc., for the past 100+ years (and in some cases, longer). Some of those companies were active participants in the atrocities. Others went along, and still others might have found it offensive but didn't speak up or do anything about it.
Some companies may have tried to atone for their past. Others may have tried to hide it. Still others may refuse to move on. Perhaps it is performative, and perhaps it is substantive.
I can't speak to the issues at play in this particular instance because I don't know the background in enough detail. There may be other issues or concerns with Prosus, its subsidiaries, other holdings, etc..
All I can say is that we are volunteers here with our time and our expertise. Hopefully we're here because we find joy in sharing that with others. But, StackExchange is a for-profit company and our passions and time support their bottom line. If who owns that bottom line gives you pause or troubles, then it's always worth asking yourself if you still enjoy the experience.
I won't attempt to change your mind. That's not my place. And I wholeheartedly support you exploring your social and moral responsibilities with respect to your time and expertise. Do some research, if you want to, into what commitments have been made, or not been made, with regard to the issues you find important. Arguably the most important benefit of a free marketplace is that companies provide what consumers demand. For a long time, the primary demand has been low prices. But there is a growing demand for social responsibility in corporate behavior, whether it is in investing, purchasing, doing other business with, or in our instance, volunteering for/participating in their community.
If you decide you no longer find joy in the experience with the site because of the issues you identify, then I encourage you to use your time in things that do bring you joy. Nobody can replace your time. Your contributions here have been immense and you would definitely be missed.
If you do decide to continue, then I hope it is as rewarding and fun for you as it has been. Okay, well I actually hope it is even more rewarding and even more fun than it has been because this is a great community with tremendous potential and I'd like people to enjoy things more than they already do!