[ars]

It's hardly clear that building, installing, and maintaining all the equipment necessary to do that would require less energy than the methane they are wasting.

To a rough approximation, the fact that no one found it financially worthwhile already tells you that you need a ton of resources to make it happen.

[dv_dt]

Seems like in the US there are 500+ landfill gas projects operational with about another 500 possible sites - so not exactly no one.

https://www.epa.gov/lmop/basic-information-about-landfill-ga...