How does Snax calculate expected reward?

Ref: https://snax.one/faq

As you can see here https://snax.one/steem/space-man my SNAX rewards reduced from 10 929.9298 SNAX to 219.4842 SNAX

Now I start wondering how they are calculated? Snax Foundation at https://snax.one/faq explains rewards calculation as:

Every Scoring Round Snax distributes a limited amount of tokens to the users of supported social media (e.g. Twitter). The amount of tokens, which user will receive, depends on the Attention Rate of their content, and the total Attention Rate of all content published on the social network.

For instance: Maximum amount of SNAX to be distributed as a reward for the last Scoring Round is 500 000 000. During that round, Karl made 3 tweets, which Attention Rate is 300, 700, 500 respectively. Total Attention Rate of all content published on Twitter for the same time is 1 500 000 000. Given this, Karl will receive:

(300 + 500 + 700) / 1 500 000 000 * 500 000 000 SNAX = 500 SNAX

So this means that the more the users, the less the rewards.... Now it makes some sense that why SNAX rewards are getting reduced...