To clarify, Trump passed no such law. It was a supreme court ruling that happened last year, during the end of Biden’s presidency. It only applies to official actions, so could be interpreted to not apply to violations while campaigning for office (but this is the same supreme court that put the presidency above the law)

It gives the president unchecked power, if they choose to abuse it

Anonymous data sources are largely a myth. The idea you can have large sets of data remain anonymous is unrealistic. Once you have enough data points, it’s easy to de-anonymize almost any individual