If Chris sincerely did not intend to sign the contract, he really should not have been in the habit of accepting contracts with a casual single-word reply in the first place. Had he insisted on a more formal process in prior negotiations with SWT, I doubt the judge would have granted summary judgement in this case (and SWT probably wouldn't have assumed the thumbs up was a signature).
[0] https://www.livelaw.in/pdf_upload/2023skkb116-480130.pdf