I noted that too and it's really weird. So, they do no have backup of their part of the data (or they don't want/are not able to restore it) but they still have the customers data?
Perhaps things were running in maintenance mode already, and there is no longer the desire to run this part of the business, so they took this unfortunate opportunity to wind things down.
Maybe they’re compromised but data seems intact, as in it’ll be irresponsible to keep serving on the Internet but most of it are probably not maliciously altered?
Yeah, it's pretty common for hackers to upload backdoors to random web sites when they can and exploit them at a later date. If we're talking about a full server compromise then I wouldn't use those downloaded data for anything except for analysis/archival purposes, unless it's been thoroughly cleaned first.