Ainsworth played 14 games for the Eagles since making his debut in the 2018 season, featuring on two occasions this year.
Neither Collins or Johnson made an appearance for the Eagles at AFL level, having joined the club in the past couple of years.
Johnson was drafted to West Coast via the 2019 National Draft, while Collins was selected in the 2021 Mid-Season Draft.
“These decisions and conversations are always difficult, but we felt it important for the players to make the calls now, rather than leave them in limbo through the trade period,” West Coast coach Adam Simpson said, per the club's announcement.
“I would like to thank each of them for the contribution they made to the club, particularly 'Bubba' (Ainsworth) who has been here for the last four years.
Three players will not be offered contracts for 2022.
We thank Brayden, Ben and Will for their hard work and wish them all the best for the future. https://t.co/oEMrzSUM67
— West Coast Eagles (@WestCoastEagles) September 17, 2021
“They are all good young men with plenty of football ahead of them and we wish them well for whatever is in front of them for the next phase of their lives.”
The Eagles have Oscar Allen (2025), Callum Jamieson (2022), Jackson Nelson (2022), Liam Ryan (2024), Dom Sheed (2025), Brad Sheppard (2023) and Zane Trew (2022) have inked new deals with West Coast this year.