Netted about $25 from their funding round, which is very nice. I can imagine if 1000 companies did this, then on average, many open source maintainers would have their living expenses covered in most parts of the world.
That said, in my case, $25k/yr isn't enough to survive on where I live without aid. Not all open source maintainers need to make a living from their open source work, but it will almost certainly increase the quality of our open source libraries if the developers both choose to do that and are able to sustain their living.
I wrote about the open source funding problem a while ago with my thoughts on solutions here: https://matt.life/writing/the-asymmetry-of-open-source
I don't actually go into these "payments-scaled-by-dependency" solutions because the one big problem I see is that it doesn't distinguish between projects and developers who want/need to make a living from their work, versus those who just want a coffee for motivation to keep going. Surely companies should want an active relationship with the developers of their most important and fundamental projects as well. This is why I typically advocate for sponsorships. Maintainers extend their reach for sustainability, and companies "reach the reach" of those they rely on and establish a business relationship to satisfy what open source licenses leave lacking.
Granted, their approach is certainly easier than developing relationships with all the developers, but I am curious to see if they will reap the results they are hoping for in a few more years.