* 1x extra cost for all the pending features for next 3 years
so 21 * 200000 * 1.5 * 0.5 * 2 = 6.3 Million
* since they mentioned they were running largest instance in 2020, which is r5.24xlarge i.e 15.84 per hour
* they grew 100x from 2020
* assuming they went reserved instances, they would have gotten about 50% discount
* at this scale, they would have got atleast 20-30% enterprise commitment discount from aws, lets consider 25% discount
so 15.84 * 730 * 12 * 100 * 0.5 * 0.75 = 5.2 Million
if they were to go with planetscale and even if planetscale charges them 30% extra, i.e 6.76 Million, which means they are only saving about 1.56 Million per year, so it will take them atleast 4 years more to realise their cap-ex investment into building this in-house, not to mention all the extra maintainence outside the new features they are yet to implement, like reliability, observability, version upgrades etc,...
* 21 engineers worked on it
* average salary 200K per year
* 18 months i.e 1.5 years
* 50% of the bandwidth
* 1x extra cost for all the pending features for next 3 years
so 21 * 200000 * 1.5 * 0.5 * 2 = 6.3 Million
* since they mentioned they were running largest instance in 2020, which is r5.24xlarge i.e 15.84 per hour
* they grew 100x from 2020
* assuming they went reserved instances, they would have gotten about 50% discount
* at this scale, they would have got atleast 20-30% enterprise commitment discount from aws, lets consider 25% discount
so 15.84 * 730 * 12 * 100 * 0.5 * 0.75 = 5.2 Million
if they were to go with planetscale and even if planetscale charges them 30% extra, i.e 6.76 Million, which means they are only saving about 1.56 Million per year, so it will take them atleast 4 years more to realise their cap-ex investment into building this in-house, not to mention all the extra maintainence outside the new features they are yet to implement, like reliability, observability, version upgrades etc,...
what am I missing?