Content scraping isn't HubPages fault. Unfortunately, there are millions of websites on the internet, and you're going to have thieves at any site if it's of any worth. If you find your content being stolen, then you need to report it to the DMCA.
Hurdles of making money on HP? I don't know how much money you're looking to make on HP, but you have to continually provide stellar hubs. This will bring you traffic through Google or Bing searches. You may also do your own advertising through social mediums. Most writers won't make enough of an income for daily living. So, you have to really think about your priorities. If money is the only reason why you've been writing on HubPages, and you're not doing well with that, you may want to consider another source of employment.