It's not just worms in the wild, there are a range of companies growing and harvesting these same bacteria for feeding fish and livestock. It seems to just be a cultural hurdle keeping them from becoming an ingredient in our own food. See this article from 2016 about Calysta of Menlo Park and Unibio of Denmark:

https://www.newscientist.com/article/2112298-food-made-from-...

We're more indirectly already eating methane as it's the source of hydrogen, for making nitrogen fertilizers out of thin air.

https://en.wikipedia.org/wiki/Haber_process

Reminds me of The Swarm by Frank Schätzing.

or also "The Invinvible" by Stanislaw Lem, published in 1964.

https://en.wikipedia.org/wiki/The_Invincible

https://de.wikipedia.org/wiki/Der_Schwarm#Verhältnis_zu_Werk...

So we should watch out for the canaries and the whales then ..