Apologies if this is off-topic. AFAIK, Google Maps allows 25,000 map views a day at no cost, which translates to about 750k/month. In contrast, Mapbox charges $149/month for just 300k/month. So Mapbox doesn’t seem to offer a better deal in this regard - or am I missing something?
Maybe Google is cheaper because your website users have to pay Google with their data? I think this isn’t the right place to discuss about prices of any OSM based companies.