I see this claim all the time, and it bugs me every time. Obfuscation is a perfectly reasonable part of a defense in depth solution. That’s why you configure your error messages on production systems to give very generic error messages instead of the dev-centric messages with stack traces on lower environments, for example.
The problem comes when obscurity is your only defense. It’s not a full remediation on its own, but it has a part in defense in depth.
You can have non-markdown files in your vault, but I’m not sure how readily you can search them by default; there may be plugins that support that use case though.
For me, it’s sheet bend, bowline, and round turn and two half hitches. I also tuck a lot of eye splices, but that’s more just for fun; a bowline will work fine most of the time instead.
More to the point, when’s the last time you were in Sun’s Refuge? For me there was one time a couple months ago where I accidentally clicked the wrong thing on the Spearmarshal’s Plea when I was trying to go to Vabbi; other than that, it’s been years.
Protonmail has good Black Friday deals of you want to de-Google a bit. FoundryVTT also does a good Black Friday deal if you’re looking for a virtual tabletop for D&D or whatever other TTRPG you want to play.