Yes it was trivial to obtain which is why it got so much attention here, more than any other attribute. It became harder to obtain once suicide cases started accumulating (I don't know how common it was before RTD/euthanasia research groups started looking into it but it must have been used by someone considering its toxicity was understood) and public pressure started mounting with all the exposés and lobbying. I don't know at what point, probably 2022 when standard companies started to implement restrictions.