Why do people in Equatorial Guinea mostly speak Spanish?

The primary language spoken in Equatorial Guinea is Spanish, but not entirely.

Although Spanish is the official language of Equatorial Guinea, it is not spoken by the majority of the population. The most widely spoken language is Fang, a Bantu language spoken by the Fang people, who make up about 85% of the population. Other languages spoken in the country include Bubi, a Bantu language spoken by the Bubi people, and Portuguese, which is spoken by a minority of the population, particularly in the capital city, Malabo.

Equatorial Guinea was formerly a Spanish colony and gained its independence in 1968. Spanish was the official language during colonial rule and continued to be used as the official language after independence. It is used in government, administration, education, and media, but it is not spoken as a first language by most of the population. Fang and other local languages are more commonly used for everyday communication within communities.

So while Spanish is indeed spoken in Equatorial Guinea, it is not the most commonly spoken language.