It is simple logic. Two different people reading the same text will not think the same way about what it referring to.
Scriptures are not the same as a newspaper article, which is straightforward factual information. Some scriptures are straightforward but some are not. That is why there are so many online verse interpretations and interpretations of the same scripture are different.
People have
different understandings of the same scriptures.
Who are the 144,000 in the Bible?
One understanding is that the
144,000 are recently converted Jewish evangelists sent out to bring sinners to Jesus Christ during the seven year tribulation period. Preterists believe they are Jewish Christians, sealed for deliverance from the destruction of Jerusalem in 70 A.D.
144,000 - Wikipedia
Will only 144000 go to heaven?
Based on their understanding of scriptures such as Revelation 14:1-4, Jehovah's Witnesses believe that exactly
144,000 faithful Christians
go to heaven to rule with Christ in the kingdom of God.
Jehovah's Witnesses and salvation - Wikipedia