Upvotes doesn't charge fees as steemit is fee-less and stake based.
But they do have a cost due to limited supply of 10 per day or else you'd drain your voting power.
It's mining through human action instead of hashing. Upvotes have a human action/interaction based cost that is clearly measured using VP.
When @fitinfun made her comment I think she tried to communicate that nothing on your steemit wallet leaves your account. She probably didn't thought about the voting power drain.
So you are both correct in your respective contexts.
Upvotes doesn't charge fees as steemit is fee-less and stake based.
But they do have a cost due to limited supply of 10 per day or else you'd drain your voting power.
It's mining through human action instead of hashing. Upvotes have a human action/interaction based cost that is clearly measured using VP.
When @fitinfun made her comment I think she tried to communicate that nothing on your steemit wallet leaves your account. She probably didn't thought about the voting power drain.
So you are both correct in your respective contexts.