Theres nothing unsound about ads on nostr if done tastefully.
Avoid replicating crap of the past.
* all ads should be vetted by a human (non vetted should clearly indicate, along with who paid for it)
* ads should be lawful and appropriate (e.g., no ads for speedballs and grenade launchers on a childrens site)
* ads should preferably be somewhat contextually related (e.g. no ads for scented candles on a car or gun site, but aftermarket mods would be fine)
* ads should stand out as ads vs appearing as part of site/app structure to avoid tricking users
* ads should not late load bumping ui elements out of the way or in response to hover operations that may garner more fraudulant ad clicks
* video/audio ads shouldnt preload and intersperse with streaming content without a way for user to bypass. The YouTube model is not what I want to use