No developer is going to be sued for their application having no accessibility features. The one who might be sued is an employer forcing some employee to use t

No developer is going to be sued for their application having no accessibility features. The one who might be sued is an employer forcing some employee to use the software to perform their task without any other alternative, essentially making it impossible for that task to be performed by that employee. Unless you are in a position to cause this, you are not going to be affected (and even then, you getting sued is very unlikely unless you are said employer). In practice the worst that can happen to you is people with accessibility needs not using your software.