Platforms like that are still considered public forums when they are communicating in an official capacity and they are required to archive and preserve their communications. Whether or not they actually do... If you want to call them on it you can open a FOIA request.
Here's what NARA has:
Obama: https://www.obamalibrary.gov/digital-research-room/archived-white-house-websites-and-social-media Trump 1: https://www.trumplibrary.gov/research/archived-social-media - doesn't look like they have files freely available
Nothing for Biden yet
I know that you mean a "shithole" country, but I think 2nd world country is more accurate here