Yep, that's all it is. Don't know if they picked random milestones or if it's based around the average number of hours played across all users though.
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Answer to all questions
https://developer.valvesoftware.com/wiki/Steam_rating
Basically your steam rating is 1 point per 3.2 hours every 2 weeks up to 10 max.
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What is steam rating, i have 10 but what does it mean?
Has it something to do with how many hours you have played the last 2 weeks or what?
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