How to create a revlog from Anki:

dump.py

import os

with open(os.path.expanduser('~/Desktop/revlog.csv'), 'w') as f:
  f.write('id,cid,usn,ease,ivl,lastIvl,factor,time,type\n')
  for row in mw.col.db.execute('select * from revlog'):
    f.write(str(row)[1:-1])
    f.write('\n')

Dumping Anki's review log.md

Dumping study log (Windows & Mac users)

1. Run anki's console with Ctrl+:
2. On a console window, paste the code (import os ~~~~~ write('\n') on the top white box, and type Ctrl+enter
3. File called revlog.csv would be at your desktop. Upload that file.

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For privary-concerned: What revlog.txt does.

revlog.csv has these as a content, as indicated here.

• id: Time you did the review
• cid: Time you made the card. Unique for each card.
• usn: Some metadata used for AnkiWeb sync. It tells which data is newer, on web or on your PC.
• ease: What button you pressed. Again/Hard/Normal/Easy
• ivl: Next interval of the card. (You should wait for interval time to study the card again)
• lastIvl: Previous interval of the card
• factor: SM-2 algorithm related thing
• time: Time spent for each review.
• type: Type of review (new card? learn? relearn? cram?)

There aren't anything privacy-related I think. It may reveal the time you do study the most, the time you create the card the most. That's all I think.