Samuel L. Jackson will do practically any film you throw at him, as long as the paycheck is decent. If you take a look at the films he has done over the last decade, you'll find a bunch of terrible, obscure films that had budgets of $10 million or less. Unicorn Store was probably one of the cheapest things that he has done in recent years (I can't find any info on it's budget, but it looks like it was made for less than $5 million), but I guess they were able to negotiate a paycheck that satisfied him.
He's let himself be completely castrated by the left. He flat out admitted he made his money and doesn't care about what others think or criticize him for. But instead of continuing to be an angry, screaming Negro, he preaches about dumb PSAs, hugs nu-Spike Lee and makes this kind of shit.
The 1993 version of him would call him an Uncle Tom and threaten to light him up as a match while he burned the white folks' house down.
I don't really know the history but I'm vaguely aware that tons of SJW cockmic hackfrauds like Gay Semen hung out and maybe even got their start on his forums. And somehow these forums indirectly birthed the nasty cockslut himself.