[Endlessly]

Lol, like how when it loads you see the hidden text and then it disappears.

Another option might be better to process the text, swap out each letter with for example X — or even better a ID-key, then render the font you made.

If you used the ID-key, you could even encrypt each key, tag them by type (spoilers, swear words, personal info, etc) - though for obvious reasons that would require server-side code.

[londons_explore]

You only see the hidden text because your browser renders it with a different font first.

Its the font itself doing the censoring, not some script, which IMO removes a good chunk of the 'neatness' of this solution.