I'm not sure how many nulled plugin sellers there are here but if you're having problems with any depot or are unsure of how to check for malware and malicious code, blackhat scripts and data scrapers, backdoors etc why not just learn to null plugins yourself as an alternative if you got a bit of spare time? That way at least you know it's safe.
I would say i''m a beginner/intermediate at it and do it as a hobby here and there but getting most types of nulls are probably not as difficult as you might think. Far easier than making the effort of actually developing a proper plugin anyways LOL