My browser also fails to open them, unless I make the following change:
NSFW WARNING!
Original link example: https://api.redgifs.com/v2/gifs/mediumaquamarinecharmingtahr/files/MediumaquamarineCharmingTahr-silent.mp4
Becomes: https://redgifs.com/ifr/mediumaquamarinecharmingtahr/
(Please forgive including NSFW link to demonstrate link modification)
There are 3 changes to the link: remove api, replace first two subdirectories with ifr, and remove last two items
Wanted to share in case anyone else has the same difficulty
Personal responsibility? Responsibility to what, ruin the environment? Ignore pandemics? Cut education funding? That kind of personal responsibility?