Think about a startup who does not care their customers. This is Evernote(discussion.evernote.com)
discussion.evernote.com
Think about a startup who does not care their customers. This is Evernote
https://discussion.evernote.com/topic/104432-native-linux-client/?page=0#comment-226984
But that's not because they don't put out a Linux client.
A company cares about their existing customers and target market. If they don't intend to compete in Linux, then Linux users are not their customers.
And of course a company doesn't have to comply with anything some customers might want to care for their customers.