Someone has done a lot of good and unnecessary work

[JACEK1]

Hello.
Suppose someone has done a lot of good work but the work is useful to noone. Nobody takes advantage of the work.
Could I say "Someone has done a lot of good and unnecessary work" or "Someone has laboured in vain".
What is your opinion?
Thank you.

 

[Tarheel]

Hello.
Suppose someone has done a lot of good work but the work is useful to NO ONE. Nobody takes advantage of the work.
Could I say "Someone has done a lot of good and unnecessary work" or "Someone has laboured in vain".
What is your opinion?
.

"Someone has labored in vain" is a common enough expression.