No, no and no.

NVK was pissed that his product was listed as not reproducible. His own website - bitcoinbinary - does not list versions of products if they are not reproducible. So when you go to his website and see "oh, product X is reproducible" and then head to the download page, you might get a binary that is to the best knowledge of all experts not reproducible.

WalletScrutiny on the other hand warns visitors and followers on Twitter when a new update of any product fails to be reproducible.

WS never requested money for a review. On the contrary: The order in which reviews are done is determined in the methodology of the project. WS did ask for money and did receive money as laid out on the donations page but not once was the product of a donor reviewed as a consequence of donating.

All claims at WalletScrutiny are verifiable. Mycelium happens to value highly to be reproducible but doesn't get any favored treatment.

Learn to code.

/jk

I'm not familiar with Matrix but it appears to be federated and more complex. In nostr, relays are not required to talk to each other and data is not required to be stored on servers.