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Do you mean, don't consider accessibility, security and privacy because statistically speaking your 100 customers won't care about those things?

You must have read a different blog post because I don't see anything arguing agsinst accessibility, security or privacy in this one?

No, your only 100 customers. And here your customers are not huge corporations with thousands of actual users each, but just individual users.

But certainly, you should care about security and privacy even if you have just one customer.