Definitely due to trademark disputes and political pressure.Trademark makes sense, ICANN has a whole program around that: https://www.icann.org/resources/pages/trademark-infringement...
As for political pressure, do we have any examples?
Consider the eBay stalking scandal [1] and ask if those doing the stalking would be willing to bribe or coerce someone to seize the blogger’s domain.
Has ICANN (or registry) ever been bribed or coerced? I understand a low quality registrar can, and can possibly take over a domain, but there is recourse (and punishment such as loss of registrar status) around these situations. I would of course avoid these micronation tlds and stick to well established tlds like com/net/org.