Norway has a $900 billion sovereign wealth fund. Is that a problem too? If you never heard about Bezos's wealth, would you suffer any troubles because of it? I think it's fine.
Bezos' wealth (and all the massive political power it represents) is almost totally unaccountable. This is the real problem of wealth inequality. It's not that some people have more material goods than others. It's that levels of wealth like that undermine the political systems that we have constructed to seek fair, just, and peaceful resolution of disputes. It is a road to tyranny.