Uniform Color
A well-designed child resistant package for pods and placing them out of reach of small children is the first defense.
The idea for uniform color seems to be to make the pods less appealing to children, so there are no accidental poisonings. The swirls of color can make them look like candy.
There have been suggestions to enclose each pod in its own plain wrap (adds to environmental waste), add warning labels to each pod (a detergent to the Tide Pod challenges seen on TikTok), etc.
The liquid inside is super concentrated. I would think taste alone would deter accidental ingestion, but for a small toddler or pet who weighs so little the concentration could cause serious issues.
The bottom line seems to be that changes made to the pod are to make them less likely to be a source of accidental poisonings and a labels that clearly state the dangers.