State by state. Many do not. In most where it is offered the time is limited (2 hours typically), which with long lines and travel time may not be enough. It is also unpaid time.
But wealthy New York City, where Democrats run the election commission, was a notable shit show in the recent election.
Dealing with the unequal provision of resources is a big deal, I don't mean to dismiss it, it just isn't the only issue.
It's absolutely about a failure to install proper checks on entrenched power.