I would recommend MalwareBytes. However, macOS already includes XProtect, which is a regularly updated blacklist of malware. On top of that, there are lots of built-in security features that make it very difficult for malware to do damage: processes are limited in what they can read or write.
Of course, I'm not suggesting that 'Macs don't get malware'. But ...
The native way to do this is to use Xcode 12 and a free AppleID to make a custom app using AVKit and SwiftUI.
Xcode can take your video content and display it as a custom app. QuickTime Player and Xcode can record the screen so you could fake pre-roll Home Screen content and add that to your “actual” video content so ...
If you installed it from the App Store you can delete it from LaunchPad or Finder. Finder moving it to trash works for the direct download version of the app. Spotlight should reveal the location of the app in most cases.
elm / pine / lynx used to be enough for email and web browsing but now you’ve got requirements that are at odds with plain text display. (And we’re all in the same boat as you - ...
It misses #8 (no mobile version) and #9 is so-so (loses some formatting but I'm thinking it's Notes that's the problem)...but it is very stylish, snappy, and seems to have a lot of nice UX innovations (e.g. quick replies below every email, sort emails into folders with pre-defined keystrokes, themes...)
I was using TextEdit on a Mac, and nohillside's solution didn't work for me because I needed to replace with a tab, not search for a tab. What worked for me was hitting option + tab in the "replace" field.
I have tried a few tools and ended up using GoodNotes.
I have been using it for 2 years, still happy with it.
A cool feature is that it sync's across Mac and iPad, and it offers apps on both iPad and Mac.