The poor dont necessarily get poorer. That is not a given in capitalism. But at some point capitalism will converge to feudalism, at that point, the poor will become slaves.
And if not needed, culled. For being "unproductive" or "unattractive" or generally "worthless".
That's my cynical take.
As long as the rich can be reigned in in a way, the poor will not necessarily become poorer.
In neoliberal capitalism they do, though. Because companies can maximize profits without internalizing external costs (such as health care, social welfare, environmental costs).
And if not needed, culled. For being "unproductive" or "unattractive" or generally "worthless".
That's my cynical take.
As long as the rich can be reigned in in a way, the poor will not necessarily become poorer.