Why did you want to make your project accessible?

I’m working on a project for an AX consultation contract. I’d love some input from. Developers and others in tech who are non disabled but create accessibility in tech.
What was the turning point for you that had you really want you product to be accessible?
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Another way of saying this would be: this presentation is geared towards small business owners. I’m looking to present the best reasons why accessibility is usability.
**No names will be used in the presentation**
E-mail responses directly to: [email protected]
Thank you for your input.