These plans are all travel policies which are poor choices for a long term traveler.
If you are living abroad for more than a year you should look into a fully underwritten policy that will cover your conditions beyond renewal. Going through underwriting at the beginning of a policy instead of during the claims process ensures that any condition that happens after to you will be covered for life, where as a travel policy will make you prove your condition did not exist before, and can refuse coverage after policy is renewed. Many even outright deny long term treatments if it is not a life threatening emergency. (check your conditions of coverage)
Imagine a situation where you are battling cancer over an extended time, claims can easily reach hundreds of thousands of dollars. A travel policy MIGHT cover the first treatment, but it will be damn hard to prove that it wasn’t already starting to develop at the time of your last payment. If you do get it covered I can guarantee the insurer will not continue treatment past their renewal extension, leaving you with a serious condition and uninsured. Long term plans on the other hand make you disclose your medical history during the application and will make an offer, any condition after that is guaranteed cover for the rest of your life on the insurers dime.
Here is World Nomads exact wording that many people gloss over:
So this isn’t a health insurance plan?
"No, it’s a travel insurance policy. It’s there for overseas medical emergencies. It’s not designed to cover ongoing illness or treatment overseas, or any treatment when you get home. "
I find it exceptionally foolish in that a travel policy like world nomads is about the same price as a comprehensive international insurance policy. This is not a good strategy for a “long term traveler”.