Even though the comic is a comic, it's not about actual fertility goddesses making food, it's about prehistoric people making up ideas like that while they expressed their gratitude for the abundance of nature.
Look, I'm a REAL person. You know how I get apples in apple season? I walk to a park near my house where there are decades-old apple trees. I don't know who planted them. Nobody today does anything to care for them. They just do what trees do. And the majority of the apples fall on the ground because nobody picked them. And I walk over to the park and I pick apples and eat them.
Oh, but I had to WALK there you say. And I had to WORK to have a home in this town. And we have to have a working society in order to pay the City to keep the park from being sold to a developer who would cut down all the trees. Or that I have to do the work of EATING the apple, like chewing it and so on.
I mean, this is just endless.
It's quite simple: Either "no such thing as a free lunch" is falsifiable and I've falsified it with real evidence OR it's unfalsifiable because you'll claim that any tangential aspect of existence that can be called "work" makes the apple not free. Either way, the aphorism is no good.
"Too good to be true" is a better aphorism because it isn't used to imply that everything good always has a catch. It doesn't say "Anything great is too good to be true", it just asserts that things that seem great can be too good to be true (they have some catch). And that's useful because we should think about all the catches and context of things. But that doesn't mean we should become cynics who just deny that anything great is ever possible.