Just downloaded the CiaraMega.rar pack linked in OP, and am rather disappointed.
Btw, can someone confirm it's hash?
SHA256: 35F9F2AD588A5C85853EDE4C6EBA78B4B3E061916DB11922AE41804270DF40F1

1. 9,5% of pictures, 155 out of 1631 are some kind of visually similar duplicate in different (lower) resolutions with metadata added/stripped and probably compressed along the way, some were downloaded from Imgur judging by filenames. I used Czkawka, a marvelous piece of Polish software to find these dupes. A few (2 or so after quick skimming) pictures are unrelated to Ciara, but were probably added for stylistic similarity.

2. Everything is dumped in one place, it could have been organized into folders: Instagram posts (per each account of which Eliza had almost a dozen), chat logs, original webcam pics (Photo on), family, derivatives and reaction pictures, etc. I'm damn sure, a big lot of pictures are video screenshots posted on r9k as reactions, these of low priority to clean archival.

3. Videos are no better: a bunch of original content (I pray hope not sourced from YouTube "archival" re-uploads), a bunch of soundless webms, a few fan music videos, utterly useless "upscales": tech gets better every month, and it's optimal to keep the most original rip instead of upscale which could be mistaken for original in the future.

4. TikTok scrape lacks a hugely important feature: timestamps in any form (filenames, file or filesystem metadata). Now it's rather hard to understand continuity.

The 'Eliza r9k' torrent seems to structure content better: everything is sorted in folders per website she posted on. I seriously expected this archive to be exact, since the size is around 10GB for both.

Torrent in question:
https://thepiratebay10.org/torrent/15391371
magnet:?xt=urn:btih:1eb2e6bc393a4800f58944cb6f98cfb18a72fe2b
This is the latest and fullest torrent among 6 torrents under same name and structure which were indexed by BTDIG, in addition there's another one fairly fresh containing what looks like another Instagram scrape:
https://btdig.com/c7a4887732eeb9dd95020826190741d310fda54e

Additionally, there is lots of side and gossip/drama content still on 4chan archive sites, e.g. Desuarchive which indexes /r9k/ as per our interest. Unfortunately, it has no boolean search for threads which makes it useless to look up third party links leading to file hosts and archives, unless all keywords (ex. 'eliza mega' or 'ciara mixtape') are present in single post. Has anyone made a scraping script for such situations? Or is it just better to download full dumps from ArchiveTeam torrents and comb them at home?

By mere providence I stumbled upon a complete archive of grubage Instagram account from August-October 2017, each file was timestamped.
Post: https://desuarchive.org/r9k/thread/40671958/#q40675686
None of the posts in conversation above mention any useful keywords in conjunction. And I assume there's lots of stuff like this buried out there.
Old URL format link (still redirects):
https://mega.nz/#!RIh33SyR!IZz_pl-LIdcuTfvVyOhzPHatcP0Psv-92sRo6SlJ3SU
New format:
https://mega.nz/file/RIh33SyR#IZz_pl-LIdcuTfvVyOhzPHatcP0Psv-92sRo6SlJ3SU
Filename: grubage.7z
SHA256: 0B307F4697DC1868EE09B93B234A523D36FFA04B71A50AC6B90E19DD469DF1B6

Don't forget other points of her net-presence could have ended on Wayback Machine and Archive.Today. If only one knew what to look for. Here's Ciara's first Infinitychan appearance where she gets the Eliza nickname:
http://8ch.net/b/res/5035390.html 
https://archive.is/v4ama
> Show us some ass. Tits are clearly too small to matter.


Last thing I'd like to address is that Imgur announced it shall start deletion of images uploaded anonymously and whatever their image recognition software marks as "nudity", and it considers too revealed collarbones and shoulder area as one, since May 15, that is - yesterday. I discovered this by chance, after clicking into Desuarchive's discussion board.