Anthropic are looking to make money. They need to make absolutely absurd amounts of money to afford the R&D expenses they've already incurred. Features get prioritized based on how much money they might make. Unless forced to by regulation (or maybe social pressure on the executives, but that really only comes from their same class instead of the general public these days) smaller groups of customers get served last. There aren't that many blind people, so there's not very much profit incentive to serve blind people. Unless they're actually violating the ADA or another law or regulation, and can't bribe the regulators for less than the cost of fines or fixing the issue, I'd not expect any improvement.