Is this still true when “telling who's a ‘robot’” is such a common thing to have happen? For instance, I've heard of at least one major platform both sending back quite a lot of UI telemetry and considering third-party clients a violation of their ToS; I haven't heard of strong action being taken yet. (I'm avoiding naming them both because I'm operating partly on hearsay and because I'm more interested in the general question.) Hasn't bigtech had a lot of time and motivation to advance “how to detect people who are using some weird software to talk to us”?
Simpler forms of technical barriers, like with the AIM protocol, were defeated in the past, but it seems like massively upgraded data backchannels, machine learning algorithms, and the new normality of silent automatic updates all the time might strongly favor a centralized defender. Plus IIRC the CableCARD wars didn't go so great, and there were presumably a lot of people motivated to save money on expensive TV packages, whereas risking losing access to all your friends for having slightly better control over something that's notionally “free” anyway sounds like a harder sell.
I don't think it's easy to defeat “socially required tech” + “automatic updates” + “machine learning” at all.