Meh, if you actually read into the actual findings of those cases, they're mostly a whole lot of nothing. Makes for a headline and that's about it. BBC complaining about a British player receiving a different punishment, hah, no bias there.
Iga for example took Melatonin that was confirmed through laboratory testing to be contaminated on the manufacturer's end.
Sinner's case is more complicated, but was still found not at fault by both the independent tennis tribunal and WADA.
You have simpletons like Nick Kyrgios comparing it to Max Purcell's case but if you read the facts about that case, it couldn't be more different. He literally sent texts to another player incriminating himself and tried to cover it up via the clinic.