Where is the line between a BSO and a cheap proper bike?

[Bicycler]

So what you're saying is any bike bought by someone who walks, rides a horse or runs electric vehicles is a BSO

[pete75]

So what you're saying is any bike bought by someone who walks, rides a horse or runs electric vehicles is a BSO

And someone who only uses bicycles to get around

[Brucey]

.... It duly arrived complete with punctured front wheel and dry bearings. I greased wheel bearing, cables and BB. .....
He now rides a full carbon road bike and an expensive Orange MTB. That crappy BSO kept him fit and got him into serious biking.

He was lucky you set the bike up OK for him; it might otherwise have put him off for ever...

cheers