This is striking: PA's Treasurer has sent a public letter to S&P/Moody’s/Fitch—calling for them to explicitly consider jurisdictions' reliance on criminal system fees+fines revenue when rating municipal bonds. Cites "the poor outcomes of such practices": https://www.patreasury.gov/newsroom/archive/2021/01-14-Municipal-Bonds.html

The US Treasury Department is in regular contact with the ratings agencies; this article covers these talks in context of debt ceiling standoffs under Obama. If a Biden Treasury were to join the PA Treasurers' call, it could have a HUGE effect; it should. https://www.washingtonpost.com/business/economy/on-debt-credit-rating-firms-flex-muscle-with-downgrade-warnings-despite-us-pleas/2011/07/15/gIQApK33GI_story.html

If a Biden Treasury were interested in such a move, it could reference—among much else work done since—the Obama CEA's 2015 report on the subject, which concluded "policy that funds government through criminal justice fees and fines is often ineffective": https://obamawhitehouse.archives.gov/sites/default/files/page/files/1215_cea_fine_fee_bail_issue_brief.pdf