It's usually marginally funded and/or essentially private ventures that back out or go bankrupt. There's cases of restaurants having to close down because they simply don't have renovation funds. If it's truly a public good it should be publicly funded. The public likely won't want to fund it, so you're gonna have to go with something more lax like exempting old construction entirely or publishing piecemeal best practices.

Like in this case, readers are to the point where a plain HTML offering should suffice. This is thankfully something that is not a ton of extra work. But for physical ADA compliance it is unfortunately expensive.