This has always been a thing forever. A Miranda warning is exactly that, a courtesy warning. Anything you say at literally any time and in any scenario barring very little can be used against you in a court of law. At the same time, you always have the right to invoke your 5th amendment protections barring very specific exceptions. AFAIK the exception is when a judge orders you to testify. Literally no other time can you be compelled to answer unless you’ve already agreed to do so.

Point: Always assume anything you say is being recorded and might come up again later. Do not rely on other people to warn you before you fuck yourself. Shut your speak hole unless your representative says otherwise.