The government is using the top 100 IP traffic ranking data. That's why servers that related directly to DOTA and CSGO are singled out.

I'm not sure that's it. Both games are hosted on Valve's servers, as is the Steam storefront and client; there isn't any obvious way that Kominfo could distinguish between the three.

If they are basing their blocks on IP flow data, though, I wonder if their block on "Amazon" is actually going to hit AWS. That'd certainly be interesting to see.

I don't think they are specifically targeting these companies but they are signaling their intention to begin targeting. They wouldn't take this step without getting the big guys to register (google/fb/aws/etc...). Now they want more of these companies to comply.

I don't see that in the article, where is it?

It's in the table a few paragraphs in. Here's a direct link:

http://web.kominfo.go.id/sites/default/files/users/4752/Daft...

I see a list of ten things, presumably the top 10 by some measure (unless they're banning exactly 10?), of which those are just a few, and not near the top. Are they maybe just popular services? I wonder if a list of 20 would include World of Warcraft or (checks notes) whatever games Origin is required for?