Yeah that's why, and maybe you are referring to this, lot of people like Universal Basic Income.

However the realistic issue is that looking at the last decades wealth doesn't spread evenly. The Internet has helped created huge almost global online monopolies (google, amazon etc) at an unprecedented rate, instead of spreading the wealth evenly.

So AI will most likely have a similar trajectory, the productivity gains will be monopolised. And we don't have a way of distributing wealth after the fact in Western Capatalism (maybe rightly so), so this is why people are afraid.