GameSparks

  100,000 MAU * $0.02 = $2,000 / month
1,000,000 MAU * $0.02 = $20,000 / month
                      = $13,000 / month with 1k minimum per month for 12 months
                        and provides Professional SLA.
                        This gives immediate post-live issue resolution.
                        5000 API requests, I guess per second
                        and extended cloud code execution time.

Real-time multiplayer is only on higher pricing tiers.

They also offer DAU model, starting from $0.006 per DAU.

Note that this pricing is per game.

PlayFab

Pricing depends on features upgraded and MAUs.

E.g. upgrading from 250 items to 1,000 items costs $19.99 / 100,000 MAU. Upgrading from 1 webhook to 5 webhooks also costs $19.99 / 100,000 MAU.

So, compared to GameSparks, you can get 100 different upgrades and it'll still be cheaper.

The highest price I found was 1,000,000 Display Names for $500.00, but that is one time fee.

AWS

Cognito: 50,000 free MAU + 50,000 MAU * $0.00550  = $275
         1,000,000 MAU                            = $4,415

Cheapest compute optimized instances are $75.6, which then need at least 1 replica behind load balancer, 2 for the best reliability. so $226.8 per month minimum?

DynamoDB:
PlayFab uses 200-400 Read Capacity and 500-750 Write Capacity.
             400-600 Provisioned       750-1250 Provisioned\
Adjusted every minute.

Lets assume 100 Read Cacapity and 200 Write Capacity:
            $9.36 + $93.6 = $100 / month, which is probably an overshot.
            Reserved Capacity will reduce the price even more.

Cheapest Redshift is $180 / month, 16 GB
ds2.xlarge - No Upfront $612