"Requiring an online connection for some features" is wildly different from DRM, and should not be constituted as such.
if the given feature can be reasonably implemented without Internet connection then enforcing it is a form of DRM
if the given feature requires periodical Internet connection to say update friends' highscores then requiring constant connection to play is a form of DRM
we can argue about the lack of LAN server software available as an alternative for the global, company funded, multiplayer server, for me lack of such a thing is fine, but some people may be more strict and require fully unlocked multiplayer too
though if a game is *solely* or mostly online I don't think it belongs here, I'm perfectly fine with their existence, but if no LAN server is available (and for some games realistically the formula makes it impossible to play with few friends locally, though you potentially could host a bigger server and perform matchmaking and so on so...) they are effectively DRM-ed and may stop working any moment for any player without notice so they simply don't belong to DRM-free store