iPhone 7 Antenna Stripes Changing Color

Here's an estimation:

The site you're likely viewing has what is called a liquid-layout, which means that the content will spread to fill it's container. So when you're rotating the phone, the viewport width is changing from the narrower portrait width to the much longer landscape width. So the text itself might not be changing size, the webpage is just adapting to fit it's new window size.

Luckily the above link also has a liquid-layout, so you can see this in action. Take the window on your computer and shrink it's width. You'll notice that the text will shift around to fit it's new container size. So it's the web page (more specifically the CSS) which determins how the text wraps.

tl:dr

CSS did it.

No. The organic material is applied during assembly. I'm not aware of any place that can "replenish" the lipophobic substance.

Apple has this to say:

"Please note that the ability of this coating to repel oil will diminish over time with normal usage, and that rubbing the screen with an abrasive material will further diminish its effect and may scratch your screen."

Source: http://support.apple.com/kb/ht3226

You can, however look into replacement covers that also contain lipophobic properties: http://www.mobimega.com/sgp-steinheil-ultra-oleophobic-screen-protector-for-iphone-4.html

Or pay for a new glass screen. Warranty will generally not cover this, but you can always ask for a quote from Apple service in or out of coverage.