This is a copyright license that grants additional rights beyond those you would normally have. It does not take away any rights you would normally have to read or discuss a published work.
2. Fair Dealing Rights. Nothing in this License is intended to reduce, limit, or restrict any uses free from copyright or rights arising from limitations or exceptions that are provided for in connection with the copyright protection under copyright law or other applicable laws.
Instead it grants you additional rights to reproduce and distribute copies of other people’s comments, or modified versions of those comments, subject to certain terms. Copying text into RFCs is a good example of a use case that would be subject to these terms.
Merely reading on a computer may technically involve copying bits around, but these “temporary” or “transient” copies are generally held not to count as “reproduction” for the purpose of copyright law and so do not require a license from the copyright holder. This is why you can read an article on the New York Times website without them giving you a written license to reproduce it. Similarly, you can read comments published here without agreeing to any copyright license.
In the language of the license, such reading falls under “uses free from copyright” or “limitations or exceptions provided for in connection with the copyright law.”