You forgot the /s. If you didn’t: it’s a pilot project, not a literal pilot.

I was gifted one last year and I love it. It has 8 little springs taken from pens, so the legs are springy.

Caution! .ecryptfs is used for an encrypted home directory. I would assume the size is because of Sims 4. Check with mount whether your real home dir is mounted via ecryptfs.

If you want to be sure, delete some big files in your home dir and check if ecryptfs gets smaller. If you delete it, you lose all personal files on that machine.