The words should remain separate when the sense is separate. For example, in the phrase “Opted in to Steam client beta” the phrasal verb “Opted in” is separate from the infinitive verb phrase “Steam client beta.”
For example, the hypothetical phrase "opt into" can not logically function as the inverse of the phrase "opt out of".
Secondarily, "opt into" has 5 million Google search results, mostly people asking if it is correct to use it, and replies saying that it is not.
"opt in to" has 71 million.
Edit: Guaranteed reproduction method found: Say it out loud. Not joking. Hear which one you are saying. Is there a tiny gap between "in" and "to"? Yeah, I thought so, lol.
"* Opted into Steam client beta?: [Yes/No]"
The words should remain separate when the sense is separate. For example, in the phrase “Opted in to Steam client beta” the phrasal verb “Opted in” is separate from the infinitive verb phrase “Steam client beta.”
Exactly the same as the example here: https://www.scribbr.com/commonly-confused-words/into-vs-in-to/
For example, the hypothetical phrase "opt into" can not logically function as the inverse of the phrase "opt out of".
Secondarily, "opt into" has 5 million Google search results, mostly people asking if it is correct to use it, and replies saying that it is not.
"opt in to" has 71 million.
Edit: Guaranteed reproduction method found: Say it out loud. Not joking. Hear which one you are saying. Is there a tiny gap between "in" and "to"? Yeah, I thought so, lol.