This is a card game for families and friends. The game itself is built to know as little about you as it can; advertising, which is how it is meant to stay free, is the one exception, and is set out below.
The name you play under, your language and which panels you like left open are kept in your own browser so you do not have to type them again. It also keeps two cookies: one showing it has already given the table password, if this server asks for one, and one for the seat you are sitting in, so a reload puts you straight back. Both are marked so that nothing else on the page can read them. Clearing your browser data clears all of it. Your name is sent to the table you join, because the other players need to see who is playing. Advertising networks may keep cookies of their own as well: see Advertising, below.
While a table is open the server keeps the game itself: who is seated, the cards, the running score and the table log. It is deleted when the host closes the table, and a table nobody comes back to is deleted on its own.
The game is free, and advertising is how it is meant to stay that way. Any ads are shown by third-party advertising networks. To show ads, count them and, where you agree, choose ones suited to you, those networks may store cookies or similar identifiers in your browser and collect details such as your IP address, your device and browser, and the pages you visit. They handle that under their own privacy policies. Where the law asks for your consent first, you will be asked before any of this happens, and you can change your answer later.
No accounts, no email addresses, no log-ins and no payments. The game keeps no analytics of its own. The “I’m not a robot” check on the front page is worked out by your own browser: it uses no cookies, involves no other company, and sends nothing about you. If the game’s own screen fails in your browser, it tells the server what the error was and which kind of browser it happened in, so the fault can be fixed. It does not say who you are, which table you are at or what cards you hold.
Ask whoever set up your table: this is a private game, and they are the person who runs it.