correct
you can, but most editors of guest posting websites don't like it
is good for any types of backlinks. Scrapebox is such a versatile tool, and for less than $200 (or maybe a little more) you can buy all of its functions and do with them whatever you can think of. No other SEO tool can beat SB for this price in my humble opinion. I've not even used it extensively since I've purchased it over a month ago, and I can only afford paying $12 per month for 5 private proxies only, but even so, it's still helped me tremendously shuffle through my dozens of lists that I had of millions of tier 2 and tier 3 backlinks to see which ones are still active, which are still indexed, I've even blasted them with auto-approve blog comments and whois / stats type of links, some of them got indexed as a result (most of them didn't, though).
You can scrape Yellow Pages, find expired domains with backlinks from any big site you want (wikipedia, forbes, cnn, etc), you can sort and clean entire lists of URLs, you can check google / bing / yahoo index, you can retrieve cached pages, meta info, track your keywords, check Alexa ranking, check MOZ metrics, check whether your links are still alive, check broken links, anchor texts, scrape articles, remove duplicate URLs, check dof0llow links, extract internal / external links from a website, create RSS / sitemaps, check for redirects, malware and phishing issues, mass-shorten URLs, check whois and resolve domains, find expired domains, and so many more that I couldn't even figure out yet in the few short weeks I've toyed with this software.
In all seriousness, mate. For under $200 one time fee you can do SEO like the real pros, so get this tool ASAP! I wholeheartedly recommend it.