How does it try to curtail free speech (which, BTW, doesn't apply to a privately-run site, of which you are currently a guest)?
What it does do is cut down on the noise in threads. Ever try to follow threads on ARFCOM or any other forum that allows endless quoting upon quoting upon quoting? I'd rather spend time reading quality responses vs. the bs found on other sites.
Tip: Highlight the part you want to quote, press cntl-c, press the Quote button, press cntl-v. Done. Doing it this way makes you choose which part of the discussion you want to quote so you aren't clogging up the airwaves with anything else not relevant to your response.
"They have men amongst them who know very well what they are about..."
- Lord Hugh Percy, on the events of April 19, 1775
Do you know what you're about? Find out at an Appleseed near you.