If it has a 69 or 420 in it they can’t charge fees…

I dunno. Depends on the nodes I guess. Like I think from strike to primal addresses there are 0 fees rn.

It's possible that it's just hiding millisat fees from you

Good q

Maybe VC money burning to promote adoption of whatever app you're using so they can collect fees later

Maybe a business model to promote adoption and make the profit harvesting data

Maybe hidden millisat fees as someone mentioned

Any mix of the above, or whatever else

Maybe you're just built different and you don't get charged fees