^Alot of these are mobile titles. The big japanese publishers are launching dozens of games at once, with a few surviving and becoming popular.
And I think Sega's localizations of Chaos Heroes Online in Japan worked decently, it hasn't shut down, announcements etc.
https://gw.sega.jp/gw/The link above links to the "SEGA ID" page, which links to the non-mobile online games, Sega is operating.
For Arcade it is currently 15 titles, tough a number of them stopped receiving updates.
For handheld/console/pc it is only about 3 at most...I expect that number to shift going forward, to PC/console.
In Japan at least, I'd say does well in supporting their online, otherwise they woudn't be successfull in the arcade, and of course with PSO2.