

Yeah no gatcha is no gatcha, no wishes so you would have to make due with starter characters and stuff you can earn without pulls/wishes.
Its basically challenge run that also tests how good the game actually is without any gambling elements.
In Puzzle and Dragons it was possible to clear dungeons to get new characters and some where really good. It was also possible to use premium currency for continues allowing one to use brute force methods to clear dungeons. It was also possible to pair your leader with friends leader reducing the need for gatcha.
https://www.zleague.gg/theportal/genshin-impact-no-wish/#%3A~%3Atext=By+avoiding+spending+money+on%2CImpact+without+impacting+their+wallets. (Probably some a.i article)
Seems like this is already a thing in Genshin impact and some players have been succesful with it.
Reddit and Hoyoverse forums seem to have handful of people doing this.