Distillation does not make Methanol.
Fermentation does. Fermentation isn’t illegal.
Entirely true, but if you distill then you concentrate it, mostly in the first bottle, the middle ones will be fine, and the last one will be full of heavy alcohols (wont kill you, but are why cheep vodca tastes of petrol, and gives rotten hangovers).
The problem is
a) most people wont have the facilities to test for methanol.
b) most people wont know they have to
c) the kind of person trying to save a few quid distilling their own vodca probably doesn’t appear on the same venn diagram as the kind of person who will do it responsibly.
d) it still explodes if not done safely
e) you mostly produce ~98% alcohol, which then needs diluting with water (which is why distilaries need a stream of nice soft water rather than in Burton on Trent with the breweries), so even the non-methanol containing bottles are deadly.