Note that the WTBTS / JW religion was split between Rutherford and Russelites (who are still around) after Russell’s death. It is notable that Russel himself split the religion from the Bible Students before him.
The JW were the result of I believe a third or even fourth schism (if you include Barbour’s Zion’s Watch Tower) of the original WTBTS/IBS and approximately 3/4 of the group did not follow Rutherford in the last schism.
There is sufficient evidence to show that he was a con-man (selling things like Miracle Wheat) and he had serious issues with the ladies resulting in his marriage and he liked to undercut and cheat his business associates out of money every turn he could. There are plenty of books to find on archive.org that talk about Russell’s dealings and ministry, he claimed, like the JW today to have knowledge of Ancient Greek, Latin and other languages but basically rip off other translations and put their own meanings in it. I remember he was put on trial for something and presented with a piece of a Bible fragment in an ancient language and neither recognized it nor could translate it. That is well described in court documents which one could look up if they were so inclined.