[thowawatp302]

Over long enough scales there is no conservation of energy because the universe does not have temporal symmetry.

[kgwgk]

Cosmologists are not serious people.

https://math.ucr.edu/home/baez/physics/Relativity/GR/energy_...

“Is Energy Conserved in General Relativity?”

“In special cases, yes. In general, it depends on what you mean by "energy", and what you mean by "conserved".”