'Micro-Dustbin Men' of the Sea?

A team at the Polymer Research Institute of Sichuan University are attempting to develop 'robo-fish' to collect and sample problematic microplastics from aquatic environments (https://www.theguardian.com/environment/2022/jun/22/scientists-unveil-bionic-robo-fish-to-remove-microplastics-from-seas). The soft and flexible ionic fish, can collect microplastics on their surfaces, as they 'swim'. The polymer from which they are made, also has regenerative ability. This allows these devices to repair damage. Currently, the robo-fish can only operate near the water surface. Attempts are being made, however, to modify them to operate in deeper waters. This technology might well prove useful in monitoring exercises but is unlikely to be used to remove microplastics, at scale. There is also the question of what would happen, if predatory fish, birds and marine mammals mistakenly eat these devices?