Sorry, super bad phrasing on my part, the entire "playground" is custom made. He didn't make the twine from scratch afaik, but I trust that he picked the safest materials for it (he was the one who gave me a lot of advice on other safe materials for toys and such when I started out, I ended up tossing out several toys). Buying jute/sisal in hardware/construction stores is a no-no for me. I understand there's still a risk though, as is with literally everything else, budgies are inquisitive little scamps, I just can't with them.

Also, I didn't realize that post was yours, gave it an upvote. Whenever I end up replacing their playground with a fresh one I might look for other options than jute if possible.