In short, even if you ignore legality, you’re unlikely to find a clean, watchable copy on those sites. Official platforms provide better quality for free (YouTube) or low cost.
If you want a scholarly or in-depth analysis of Thadam , here’s what a deep paper could cover:
"Thadam 2019" is a Tamil thriller film directed by Magizh Dhaliwal. The movie stars Sibiraj and Sadao Watanabe in the lead roles. The film's plot revolves around a mysterious event that takes place on a flight, and the subsequent investigation that unfolds.