The form you fill is only needed for upgraded access, it requires filling multiple pages with minimum character limits (not very Twitter like). It was approved automatically for me, but the basic API is fine for regular users. If you do any kind of analysis though, basic and upgraded Twitter APIs are useless and too rate limited even if it seems generous.
For example, I have a colleague who has been a big twitter user. They’re a passive listener on the site, and want to move to mastodon because people are moving. They created an account on mastodon.social and struggled to find their people. I suggested some tools that would help… and they refused on grounds that they were afraid the tool would abuse their twitter login information.
I wound up trying to explain oauth scopes. They didn’t get it and still haven’t tried. There is no way this person would sign up for a twitter dev account. But they are on Mastodon and putting some effort into figuring it out.
That said, the proportion of people making the move who also want to set up a crossposter might well be much more technically inclined.
They're not overly inquisitive, but it seemed that a human judged the comment you write, and there was some delay, so it's probably not something most people would do if they want to give a third party service access.