Use standard domains

[yepher]

This is a fantastic repo. I love how you have boiled things down so well.

I suggest you be careful about using domains you do not own in your examples. For instance, this uses [mysite.com](https://github.com/ByteByteGoHq/system-design-101#url-uri-urn---do-you-know-the-differences uses) as an example domain.

According to RFC 2606, using a domain outlined specifically as an example is more appropriate.

Using a domain line example.com would still keep the very high quality of diagrams and information you have and reduce potential unintended consequences like induced spam if someone owns that domain.