Commercial decks, where the deck maintainer is paid for his efforts, make a lot of sense.
And I suppose if they are making money out of the ecosystem, it also only makes sense that commercial deck makers make a contribution to the technology that makes it possible. I suppose I would prefer that be a contribution rather than ownership and custody, but I suppose Anki's license terms (it is AGPL3+ - I think without a CLA) prevents them closing it.
So cautiously optimistic
I would substitute "the material" for "the cards" in this sentence. Making the cards yourself is one way to do that, but it's not always the most time effective - imagine the extra work put onto a medical student having to make the cards for every subject they need to cover. That is what ankihub does and it seems to be very popular
But yeah: downloading the median deck off of ankiweb: very sub-optimal