One question,  if someone spends time to make content ( for example,  a video) , they would post it on YouTube or Twitter to make money ( ads), they won't put it on Nostr because they don't make money on Nostr. People can zap and tip and donate on Nostr, but it is not much and not make money forever as on youtube because of ads. If there are no ads on nostr, people will make no money, nostr will not attract hundreds and billions people to put Content on nostr. No ads, no money, no users, it is that simple. Money decides everything. But to attract companies to display ads on Nostr, we have bot issues on Nostr, companies don't want bots to view their ads, only humans can buy products. So, to me 2 issues: ability to attract companies to display ads and prevent bots. Solving these 2 issues will scale Nostr.