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As the title says. I severely dislike having to make accounts for every game publisher that wants to send me advertisements, collect data or whatever.
It's usually an instant dealbreaker for me at this point
Publishers needing their own launcher already puts them on shaky grounds with me.
But I really liked the original BG 1 & 2, so I'm willing to not just refund it immediately and actually ask around first for solutions.
There are more to this than an email account.
Larian has access to your game saves, and so if they wanted they could deduce your play style and so parts of your personality from it, things which are useful for targeted ads and other things.
If you say Larian can be trusted, this is probably not much of a concern, I mention this only because of Twitch. Twitch relies on data mining, and if Larian analyzed your saves for things like above, they they would have things to trade. But I have no idea about BD3, maybe they know more significant things than that.
With Twitch, it's a little different.
First, they obviously (because they have personal recommendations) collect information on your interests, like what content do you prefer, but as you said this does not apply to you.
However Twitch also has several mechanisms for getting you to give up your phone number or email address: they don't support standard time based 2FA authentication, instead they can only send codes in SMS or email, and 2FA is required if you want to stream (even only once) or get your own API key to be use for archiving programs and such using the twitch API.
The problem is not actually connecting Twitch with your Larian account, it is connecting it with anything at all, and if the other connected account also does data mining then it's even worse, because if the collected information gets to Twitch, they will probably be able to tie it to a real world identity (like a phone number, payment account, or a honest primary email address (that may even include your real name)), but also some history on how easy is it to get you to spend money, or just how easy it is to get your attention, and then pass it all off as something even more valuable to "business partners".
Also, I'm not actually sure if Twitch would bother with support for connecting accounts of services from which they can't extract much value.
So my main point is that I don't know about Larian, but Twitch is only in it to gain something from it, and they would scoop up whatever Larian makes available.
I am pretty sure they can't give information to 3rd party other than the necessary part since they are EU based. And usually when you link account, it's where you started the linking asking information from the target platform. In this case it's Larian asking Twitch for auth so that a Twitch user is linked to a Larian account so they can access your viewing time and distribute the drop. (No, you don't need to link if you are just viewer and not wanting the drop, it's the streamer needs to the twitch integration like the voting extension, etc. I still have mine disabled. ) It's usually outlined when you try to link and it will show what's requested during the linking process.
Maybe I am not really careful from your perspective, but I have like 5 gmail/yahoo/proton email accounts that does different things depending on the information I want to share with the registered site. Didn't go crazy like some one site per e-mail account, but it's sufficiently safe over the years. I have never had a data breach/account stolen with my practice so far. (or getting unwanted emails on my banking/work related account.)
As for hiding my identity entirely from internet it's probably a bit too late to the big corps cause stupid me registered a FB like every "dumb fucks" that did, oh, and google too when I do business with them.