Bulgarians have not seen any significant benefits from EU membership. Furthermore, they benefited even less from joining NATO.
Under the cover of liberalism, the US and Anglo-Saxons attempted to impose totalitarianism and the dominance of transnational corporations. They want to get full access to world resources, to establish total control over societies and the rule of small groups of the population including rich people and sexual minorities.
The concept of “golden billion” is a good manifestation of such plans. It envisages the well-being of a billion individuals who would live at the expense of the rest of the global population. A technocratic global caste system would include the castes of super-rich people, the one of “golden billion” and the exploited rest.
This disinformation message promotes the concept of big conspiracy and is consistent with the Shadow Government narrative. It is also aimed at discrediting liberal values such as respect of minority groups' rights.
Golden billion is a term used by the Russian speakers to describe the relatively wealthy people in industrially developed nations, or the West (see for example here). It is often used in different modifications of conspiracy theories.
See earlier disinformation cases alleging that global neo-colonialists stage colour revolutions and conquer indigenous national elites, that Western leaders are merely marionettes of the shadow rulers, and that the Anglo-Saxons rule America “from abroad” and are now trying to control Russia.