Since this is a statistics app, entered data on players, matches etc. is collected. But you can always remove yourself as a player/user/account. As described below you are able to see how this is done.
Press your profile picture on the dashboard in order to view you player/user/account.
Press the pencil in the upper right corner to edit the player/user/account.
Scroll to the bottom of the "Edit player" page and press the "Delete and clear all".
As written the "Delete and clear all" button removes everything relating to the player/user/account and related information will be anonymized.
Matches etc relating to the removed player/user/account will still be visible, but the player/user/account will be listed as [DELETED] and everything is anonymized.
Again matches with the player etc will still be visible, but the player will be listed as [DELETED]. The points the player had is still intact, but isn't related to a person/account at all.