The item speaks for itself, with reader commentary.
There is federal law and a DOJ unlikely to make waves; then state law and international anti-corruption law is mentioned in comments, and there was negotiation and agreement somehow formed in at least six separate instances between big law firms and Trump's people. Presumably those inside the firms in some manner agreed before the deal closed. Perhaps there was broad discussion within some firms before agreement was final.
In exchange for relief from threat of sanctions things were bargained for and concessions were given, for a favorable official action.
It is an interesting read. The linked item consolidating the House letters: https://min.house.gov/sites/evo-subsites/min.house.gov/files/evo-media-document/04.24.25-letters-to-law-firms-on-trump-administration-agreements-all.pdf
It seems many pages long but it is aggregating all the letters sent to each of the firms that caved. Details may vary but in essence, identical letters.