What I've heard is he wanted to refit the yacht that he bought, so it could support a deep sea submersible.
So... to expedite the refit, he essentially just bought the entire dockyard, the company that owns it. Literal fuck you money lol.
And he does legit use that yacht/remote submersible to sail out to deep seas, exploring the hadal zones south of Japan, other places.
https://www.geeky-gadgets.com/gabe-newell-inkfish-unclassified-ocean-creature/
As I've said in other threads, dude is just actually playing Subnautica IRL.
https://youtube.com/@inkfishexpeditions
https://luxurylaunches.com/transport/gabe-newell-explorer-vessel-08172025.php
https://www.vard.com/articles/inkfish-and-vard-signs-contract-on-groundbreaking-research-vessel
I think these are all ... revolving around the same ship, not 100% sure.
Yeah he's a billionaire, but he at least seems to be an old school tycoon in the sense of... doing actual philanthropy, instead of fancy accounting fraud / money laundering with a non profit happy face on top.
Also, barely anyone knows much about this, so... probably not a naked ploy for positive PR?
EDIT:
If he buys an entire island, or starts trying to do 'sea-steading', then we should be concerned.
That shit is... insane diamond hands crypto ancap fucking nonsense, unless or untill someone actually comes up with an actual well thought out plan... So far all I've seen is complete idiocy at being anything than an elaborate fraud.
If Gabe goes full Andrew Ryan/Cave Johnson, then yeah, we have a problem.
To my knowledge... he basically just has more money than he knows what to do with, so he tries to fund things that would be difficult to fund otherwise, that he also finds neat.
He's also basically founded a seemingly much more legitimate than Elon's neuralink type thing, that does novel research into BCI/brain implants, but like, targetted at actual medical breakthroughs, not like, trying to make a mass consumer general use product.
https://starfishneuroscience.com/
Judge for yourself of course, I've not deeply looked into these things, just apparently a bit more than most.
I can say that I haven't heard of any pigs or monkeys being horrifically tortured, so that's probably good.