It kind of all went downhill since when Twitter essentially banned third-party developers from the platform (or at least all Twitter client makers).
Third-party Twitter client-makers could've offered users an experience Twitter itself seems unable to offer - such as much better anti-abuse systems, better spam protection, better identification of bots, and so on.
But no, Twitter had to ban them so it can "control the experience" (as in offer you whatever type of ads they wanted and not have to deal with client makers when pushing them to users).
Comments
There seems to have been an inflection point in 2014 at which they stopped shipping product updates.
It kind of all went downhill since when Twitter essentially banned third-party developers from the platform (or at least all Twitter client makers).
Third-party Twitter client-makers could've offered users an experience Twitter itself seems unable to offer - such as much better anti-abuse systems, better spam protection, better identification of bots, and so on.
But no, Twitter had to ban them so it can "control the experience" (as in offer you whatever type of ads they wanted and not have to deal with client makers when pushing them to users).
I suspect that was when they began to concentrate their efforts on ads & the associated tooling.