The pattern I’ve seen emerge is that the only successful candidates just happen to be of the same ethnolinguistic background as the hiring manager. Merely being Indian is not enough.
I suspect this has happened to me at least once. I was a shoe-in, checked all of the boxes, recruiter was saying they really wanted me, and then for the final interview they brought in a mid level guy who asked me questions unrelated to the role (purely a Data Engineer role but he was asking me about the intricacies of ML models). All interviewers were Indian. I would wager they ended up hiring another Indian guy for the role. I would imagine this happens to people of color all the time so I don't "mind" in that sense. The bigger issue to me is U.S. citizens unemployed because roles are filled by H-1B people (which is difficult to prove, but the evidence seems to indicate).
We'll never know what actually happened, but I suspect they had to choose between me and an Indian guy and by throwing me ridiculous questions in the final interview, they had evidence to whoever (their boss, HR, me, the recruiter representing me) that they passed on me because I didn't know enough about a subject area and therefore I wasn't a good fit for the role. I can't capture the full interview experience in a Hacker News comment but I realize the information presented isn't a dead-giveaway case of racism.
I am well aware that it could've just been that A) their requirements for the role changed mid-interview process, B) they didn't like my personality or I came off as an asshole, C) the mid level guy didn't want me as their "superior" for a non-racial reason or D) Other. But I think it's dangerous to just write off any suspected racism and blame something like personality or soft-skills. Racism is disproportionately detrimental to people of color, but it's still wrong when it's directed towards a white person.