1. Issues around funding are a higher order problem with peer review only being a symptom at best (if at all). For example, Sabine talks about the issues and focuses on grants and spends 0 time on modern peer review.
2. Fraud didn't come into being because of peer review but grows with funding. The more funding the bigger the problem. Conversely the less funding the more likely proportionally the research is fraudulent or of poor quality because there's a smaller community checking the work. We know that the more funding we spend, the more research activity a field experiences. We don't have good ways to sift out fraud proactively - it takes disproportionately more work to root out fraud and bad science than it is to publish that & reap the rewards. This is true beyond academia - it's easier to spew BS than it is to explain the truth.
3. Not registering for null results has nothing to do with peer review. It's more just "hey I did this work and I'm not going to get rewarded so I'm not going to bother spending the work to publish the null result". That exists independent of the modern peer review system & even publish/perish is ancillary to this - a null result amounts to "failure" emotionally and that can be hard to deal with. That's why there's systems now to mandate pre-registration of the experiment - so that meta analysis can determine whether or not a result has actually been replicated enough to reduce the risk of p-hacking.
4. The replication crises for particle physics is a stark example how peer review is not really contributing as much. There's two schools of thought. The first is that we just follow the math and use data to refine which mathematical model to pick. The second is that we need to come up with better philosophical underpinnings for what the math is telling us. For now the first school is winning in terms of funding dollars (& results), but it's really hard to determine a priori which path is actually the one we should be following. Moreover, the orthodoxy exists independent of the peer review system (& even independent of grant proposals).
Well, then I don't know what to tell you. My point is that the contemporary peer review process is still operating under constraints that date back to the pre-internet age, and so that process could probably stand to be improved, and using the web might be part of that, and so the presence of a discord link as a citation is not necessarily something to lament. It might be part of the solution rather than the problem.