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"opted in" is a correct and usable phrase in written English.
It refers to choosing to participate in something or agreeing to something. It is often used in the context of marketing or subscription services. Example: I opted in to receive promotional emails from the company.
Dictionary
opted in
verb
Past of opt in
Exact(49)
She opted in.
So Cameron opted in by staying out.
Otherwise, you are automatically opted in.
The big banks have opted in.
This guy (or girl) hasn't opted in consciously.
It also says that those who are opted in are 30% more likely to click ads.
Similar(11)
These are users who opted-in to using it, but are now overwhelmed by its noise.
She is co-opted in more insidious ways, too.
The evolution of lncRNAs and that of transposons may be highly co-opted in primates.
Alternatively, Ras independent secondary pathways may be preferentially co-opted in neuroblastoma tumor initiation.
Currently, the University of Michigan is the only HDL member institution that has opted-in.
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