In some cases existing. Parties in some cases are going to beis din/ rabbanim.
Someone I know was told recently that his rent was raised to 3800
retroactive to when his contract expired 2 years ago, and is now being taken to BD because he's demanding the "extra rent" from the past 2 years. Even better is that this tenant was eligible for COVID rent assistance but his landlord refused to sign the necessary docs because he demanded the rent off the books. The tenant lost out on 21k because of it.