The rule is not actually a change to the law, but a change in the way that applicants show compliance with it. The Public Charge rule has actually been part of immigration law since the 1990s. In the past, passing the test was basically showing that a sponsor made more than 125% of the federal poverty line (or had sufficient assets available). Starting Feb 24, 2020 there is a new form (I-944) that the applicant must complete in order to show that the applicant will not become a public charge. So what happened to the old form (I-864), you might ask? Well, we still use that too. This process is new to everyone so it will take some time to adjust to the documents and evidence required. Also, the public charge rule does not apply to all types of applications filed with USCIS. You should keep in mind that rule changes allow for a rejection or denial (meaning you lose your filing fee) if you do not submit the required evidence. Consulting an experienced immigration attorney on your case for more specific information.