Maybe someone could make one that relies on Web scraping instead of API usage, something similar to NewPipe for YouTube but for Reddit. Might be a while though, web scraping isn't as intuitive as API and not offense but Devs are still a bit spoiled from having unrestricted API usage since forever.
Also before other people try and tell me I am aware that you can use Personal API keys from your account, however they might crack down on that in the future and either prevent people from using it or impose more strict limitations on its usage (if everyone just gets a personal API key instead of paying they're probably not going to take it laying down).