Why not use this:

• Giving him money is useless

• Watching this movie is pointless

Makes better sense to a native English person and has a more perfunctory tone.

Why not use this:

• Giving him money is useless

or

• There's no use giving him money

/

• Watching this movie is pointless

or

• There's no point watching this movie

Makes better sense to a native English person and has a more perfunctory tone.