Earlier quoted context omitted.
At least in Germany, such agreements are afaik invalid and without a severability clause, possibly all others too. Simply because something like copyright cannot be assigned in Germany. Secondly, there are ways to use Reddit without ever having agreed to the ToS.
how do you make a comment without creating an account which requires you to agree to the tos?
In Germany lopsided contracts clauses that surrender all rights are void. GDPR also gives you the right to recall all your data, so you should be able to delete your account and all your data.