You seem to have a different remembered version of history. They very first iPhone had Wifi, and could do loads of things other devices couldn't, like play video, browse the web using a real full browser, and IMO way better typing than any physical keyboard.
You're acting like iPhone's lack of an App store on day one put it at a disadvantage, but there weren't exactly a lot of other options. The app store was released only a year later, and you could do loads from the browser before that.
I'm not OP, but if transcoding is happening on user CPUs, it's theoretically possible to modify or inject stuff into the transcoded video. There'd need to be some way of validating a transcode matches the original, which is non-trivial.
A consensus algorithm could work, but that would massively increase the required compute. I'm not even sure things like NVENC vs CPU ffmpeg are deterministic in how tbey compress video. Different encoders could very likely end up with visually identical transcodes, but the hashes wouldn't always match.
Maybe someone else has a better idea for validating transcodes?
"A few double spends" is underestimating the impact. When this has happened in the past, the whole network gets fragmented, and at some point everyone needs to decide which version of history to throw out, allowing potentially anyone to double-spend in that time frame. A bad actor with enough compute could cause a network split and put whatever they want in the ledger. Getting caught isn't really a concern if it's all anonymous wallets, and it only takes 1 unnoticed transaction to move millions.
The entire basis for trust in Bitcoin (and any proof of work blockchain) is that the network is so big, no single actor has the resources to become a majority and influence the ledger.
I think you're missing a critical part of how blockchains function: If Bitcoin was running on only 100 Mac Minis, there is nothing stopping someone buying 101 more Mac Minis, becoming dominant in the network and suddenly they can decide to just print their own bitcoins for themself.
The profitability of running Bitcoin miners is proportional to the market cap and the value of Bitcoin itself. For Bitcoin to remain stable, the total value must remain less than the cost of hardware to dominate the consensus algorithm.
Having never used Discourse before, I don't like that the default view is "Latest" and when you view "Categories" it only fits 1 at a time on screen for mobile, since it previews all the top posts still.
The MyBB instance Jellyfin has set up is much more user friendly if you're trying to get help with a specific thing.
People don't doom-scroll on forums like they do other social media, so I don't see the need to see all the latest "Why doesn't my Jellyfin work?" posts.
Yeah, as someone who hosts a private email server, don't do it. I don't use my mail server for anything remotely important, because I don't have enough monitoring in place to be sure it's working 100% of the time. Silently dropping emails is a huge deal, especially if your monitoring is email-based... It's 100% worth it paying for email hosting if you want to set up custom domains and mailboxes.