Because now wordpress cuts them and keeps only very few frames. Don’t know when they started to do this. As the posts of this blog are watched no matter how old they are, this is not constructive.
You can watch them and play with them if you go to
or with smaller sized animations, but https if you need babysitting
UPDATE (11.01.2023): Today is the 3 years anniversary of the salvaged collection. See this post and then the post about the long ddos attack on the collection in jan-feb 2020.