How it works now:

You go somewhere, make a comment, embolden some Es and wait.

Someone else reads your comment, sees the bold Es, goes to your profile, finds /r/EmboldenTheE, has no more questions.

Even if someone actually asks, what's up with the Es, you show them /r/EmboldenTheE. Then they tell you it's a forced meme. There's nothing special about it.

How it would work with a private/secret sub:

You go somewhere, make a comment, embolden some Es and wait.

Someone else reads your comment, sees the bold Es, goes to your profile, AND DOESN'T FIND SHIT except for some other comments where you randomly bolden your Es. (This is because private sub comments don't show up on your account)

They are now confused!

They'll either ask about it or forget about it (UNTIL they see another one of us emboldening their Es! MADNESS).

If they ask about it, you give them some troll excuse in the comments, BUT you PM invite them to /r/EmboldenTheE.

Now when they arrive at this sub, they won't feel among lads trying to force a meme, they will feel among SECRET lads driving reddit insane.

TL;DR: Exclusiveness and mystery surrounding this movement will eventually make it successful. What we have now is clumsy and in-your-face.

Win me over.