If I use EOS for my game, will players who bought my game on steam be able to use it’s online service?
Yes, as EOS is just abstraction for online services. There might be some API’s that you will have to do manually depending on the platform you use. I had some issue with downloading leaderboards, for example on Steam, while other things (can’t recall now which) had issues with GOG platform.
Everything else worked out of the box with EOS.
This was in UE4, I assume it advanced a lot with UE5, so you should be in much better position now 
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Thank you! I won’t have a leaderboard system in it. It’s gonna have a summoning system similar to souls games.
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