That’s why you should claim your main handle on all platforms, just don’t use it if you want privacy.
Whatvabout the platformsthat I don't know of? Or that don't exist yet?
Even major corporations don't bother with all TLDs.
It's far more plausible to not seek to have the same identity behind the same handle.
And I’m saying you should reserve your main handle - you can still have a unique one that you actually use.