This is an initial version of the script: you can edit the blacklist by replacing the content of const kWList with the list of keywords you don't want to see when browsing Reddit.
In future versions I'll add a more user friendly editor for the keywords list.

Note 1: the list is case sensitive, so you'll need to add both "Crypto" and "crypto" if you want to be 100% effective in removing posts about immaginary coins.
Note 2: the default list includes "Trump","Musk","Solana","crypto","coin" as a blacklist, only because I find all this blabbering annoying. You are free to copy this script and publish alternative versions with different keywords.