From

https://www.flyordie.com/games/help/rating_system.html

Rating reduction
Overall ratings are decreased each day by an amount depending on the current rating.

The following formula is used:
Rn = ( Ro * Ro ) / 125000
Rn is the new rating.
Ro the old (previous day) rating.

Rating	Amount subtracted
below 353	1
354-500	2
501-612	3
613-707	4
708-790	5
791-866	6
867-935	7
936-1000	8
So players with higher rating will see their rating decrease quicker.
A 500 rating will reach zero in approximately 1.5 years without playing.

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In my opinion it is biased. There should be also rule of "saving minimum rating" for players with many games, for example:

A player who already have 2000 games can not have worse raning than 18 purely due to "consistently amount substracted"

By that way, the following sequence would be something about:

20 games - minimum to "2" rating punishment

200 games - minimum to "6" rating

2000 games - minimum to "18" rating

20 000 games (very difficult to reach) - minimum to "54" rating"

200 000 games (that amount of games in not practial, even for 15 years at short games like Gomku) - minimum "162" rating.

In the follolowing sequence the amount of games is increasing by "x10..." (from 20 to 200 000), meanwhile rating "x3..." (from 2 to 162)
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What do yo guys think?