No longer are you simply one player among thousands, you are a uniquely identifiable individual who is allowed (or not) to participate only after identifying yourself to the platform stewards.
I don't think this is necessarily bad per se but it really escapes the realm of what I consider a "video game"
These competitive platforms with broad mainstream appeal are more akin to social networks, with strict rules around identifying yourself and policing of what's considered acceptable speech/interactions.
It makes perfect business sense but I wonder how many people are weirded out by having to explicitly identify themselves to sign up for a video game in the same way they would for a social network/plane ticket/hotel room/etc. It feels less like a game and more like a chore to me if I have to temper and guard my gaming experience because my real-life identity is on the line.
Next they will want scans of my photo ID and a picture of me holding the ID next to my face with a timestamp. I'm being sarcastic here but I also think this is a pretty realistic endgame. We all know that phone number verification won't stop anybody with an ounce of motivation to cheat/troll/whatever. It's just an annoying mandated virtue-signal for the real players, as well as a tacitly implied threat: obey the rules, or your real-life UUID goes on the naughty list.
To be clear, again I think this makes some sort of sense for an eSports platform, but competitive gaming as a whole kind of escapes me (old school gamer, not the target audience). Maybe they could keep the phone requirement for their professional ladder only?
I yearn for the days when my relationship with the game publisher ended when I walked out of the store with my purchase.