Ariarne Titmus spoke out against a sports betting advertisement.
The ad featured actress Sydney Sweeney.
Titmus said it sexualised women's sport.
The advertisement sparked criticism.
Other elite athletes added their voices.
The ad came from a sports prediction company.
Separately, Titmus announced her engagement.
Her fiancé is Mac Powell.
She wrote the word 'Forever' on social media.
The engagement news was unrelated to the ad.
Titmus's comments contributed to a public backlash.
Athletes from various disciplines also weighed in.