Leaving cash on the table not using AMP, it works for small businesses, the days of being selectively morale about Google are over, for sure it might end up here: https://killedbygoogle.com/ but I see clients with huge traffic from AMP, the last 2-3 years it’s been huge in for traffic and general promotion, its like a second place to index, all news is AMP now, well anything worth ranking for.