It'd be great to know what process you do use
For my own companies, we use as light a process as we can get away with. Usually something that is essentially a prioritised to-do list in an issue tracker. We rely on our (relatively experienced) people talking to each other as needed, actually writing useful documentation and engaging peer review at multiple stages to make sure we're all on the same page internally, and regular contact with our clients and ideally end users to make sure we're all on the same page externally as well.
For context, the majority of our clients make hardware products and are outsourcing the software development to us and sometimes others for different parts of their system as well, so we have little interest in some of the processes involving extremely short cycles that are popular with those building web apps (and neither do many other people working in this huge part of the software industry, because the priorities are often very different when there's physical hardware involved).
As for clients who do in-house software development as well, including those that do have web apps or APIs where very rapid iteration is desired, I've seen just about everything from 20-step Jira nightmares to very light processes built on a Kanban-style board, and yes, that includes some groups who were using the full Scrum process.
I don't know what else to tell you if you can't use Google
I can search just fine, thanks. I did, in fact, before replying to your previous comment, just in case my experience really was exceptional. I found very little evidence that Scrum was in widespread use among Big Tech firms. Here is the top result when I searched for "big tech scrum", for example; it's a widely reproduced article with a lot of content about how a lot of famous Big Tech firms avoid Scrum and a few who have tried it in the past did not do well with it. I didn't find a single article from any primary source at any Big Tech firm within the first 50 search results that said they were using Scrum. In fact the sources favourable to Scrum within those first 50 results were almost exclusively content marketing by companies that provide training or consultancy related to Scrum and other Agile methods.
I can only talk from first hand experience of working at some of these orgs and working with people who have worked with many of the others
I know people who work at Big Tech firms too. Do you know what none of them use? Not a single one, as far as I know? Scrum.
It's strange that if you have indeed worked personally at these places and you're confident that they're not shy about blogging about their methodologies, the only links you provided were a data-walled report by a consultancy I've never heard of and some random paper with a scope limited to Agile methodologies that was written in questionable English and published in a journal I've also never heard of. If Scrum is so widespread, surely you could have found some primary sources from the dev teams' own blogs at a variety of Big Tech firms?