Genius Studio is not a giant like EA or Tencent. They are a medium-sized development house based in Tokyo. Each premium CG you unlock pays the salary of the illustrator who drew your favorite character. If you love the story, consider buying a "Starter Pack" (usually $2.99) at the beginning of a route. That single purchase, combined with your daily ad watching, will likely be enough to unlock the major choices for that single book. Technically, no. You cannot get unlimited free premium choices in a live, ethical, non-malware way.
However, like many freemium games, there is a catch. The most dramatic moments, the romantic epilogues, and the stat-boosting dialogue options are often locked behind a premium currency system. This leads every dedicated player to the same Google search: genius studio japan inc free premium choices
Sometimes, yes. Modded APKs (modified Android installation files) exist that hack the localization files, tricking the game into thinking you own premium currency. Genius Studio is not a giant like EA or Tencent