No they aren't a chokepoint.
For Kickstarter, there's the alternative in Backerkit.
There are retail outlets - your FLGS. Bookstores. Noble Knight Games. Amazon.
And these days, e-commerce is not all that difficult. Paizo, Monte Cook, Pinnacle, Evil Hat, Magpie, Modiphius, Chaosium - all have their own storefonts! They are not "choked" - you can buy direct from them, no middleman.
There's individual creators out there on Patreon where you can get their wares.
How many ways around the chokepoint do we need to show before we recognize it isn't really a chokepoint?