Www.xyz.com is not considered a link

[khagesh]

Linkify does not do case insensitive match to generate link.
This regex (https://github.com/jonschlinkert/remarkable/blob/dev/lib/rules_core/linkify.js#L11) should do case insensitive match, if you think it should support it. Most of the times on mobile devices, first character is generally in caps and supporting case insensitive is a good idea, IMO.