This definitely feels like the biggest problem with this idea and I suggest we keep that techbro as far away from the solution as possible 😂

You realize that the bacteria in question were found in the wild, yes? This isn't something new. It's an effort to harness a capability that already exists in nature.

The scientists undoubtedly know this, unfortunately I, like you, am too lazy to read what they have to say about this problem. It is conceivable that the bacteria would only flourish in certain environments and plastic would become slightly similar to wood - decomposes quite slowly if you keep it reasonably dry and clean, decomposes very fast when there are water and air and dirt where enough bacteria lives present.

Ill Wind by Kevin J. Anderson and Doug Beason

They wouldn't just release a plastic eating bacteria like some sort of bioweapon. I could see that being a problem if it got out by mistake but still, how would it spread? What would stop us just using chemicals to kill any that got out like we already do with bacteria?