Timestamp proofs are interesting but a little hard to find a solid use for in that context. Most people are very happy trusting a post on a mailing list, or even the standard at this point for security researchers is a hash of your disclosure on twitter or IRC. It almost never needs to be cryptographic proof, only social.

They also have a significant issue in that they are non-exclusive. Imagine I timestamp the following messages.

    for i in {1..999999}:
     print "on the 21st of Feb 2022 the Bitcoin price will be exactly $i"

By revealing only a single proof of the possible million, I can prove once and for all that I have complete foresight, and you can't ever prove that I didn't make that prediction. Lots of these things have not entirely obvious issues like that. posting a million hashes on Twitter might raise some eyebrows, posting a million lines on IRC will get me K-lined. I have actually timestamped all of those messages though.