Short version: no accounts, no cookies, no ads, and nothing is sold. The details are below.
Your ally code
When you enter an ally code, it is sent to our roster service, which asks the game's public player data for that roster. The trimmed roster (units, gear, relics, stars and mod sets) is kept for 4 hours so repeat visits are fast, then deleted. Ally codes are not logged or kept anywhere else. An ally code in a shared link is visible to anyone you send the link to.
Did it work? and Report a mistake
Both use fixed choices only, so you can't type anything into them. A "Did it work?" answer adds one to a count for that team and tier. To stop the same person answering again and again, the service makes a code from your connection's address that changes every day and is deleted the next day. Your address itself is never stored. Your own answer is remembered in your browser only, so the page can show what you picked.
A mistake report becomes a short note naming the team and the reason you picked. It is re-checked against the videos that night.
Videos
Videos are not loaded until you press play. They then play from YouTube's privacy-enhanced address (youtube-nocookie.com), and YouTube's own privacy policy applies to that video.
Visit counts
If visit counting is on, it uses Cloudflare Web Analytics, which sets no cookies and does not track you across sites. It only counts page views.
Fonts and other files
Fonts, images and data are all served from this site. Nothing is loaded from other sites until you press play on a video.
Questions
If a Contact link appears at the bottom of the page, you can use it to ask a question or to ask for a cached roster to be removed early. Otherwise it is removed automatically within 4 hours.