I'm not sure if refs are more corrupt/biased/incompetent these days because this has been a very long standing complaint by Celtic fans for decades. Instead I think it is just that every minute of evey top side's matches are broadcast somewhere. And it is smthen so easy to extract that evidence and share it globally within minutes using online forums & social media.
In the past it was only what fans who were actually at the games reciting what they thought they saw in real time from a distance and often a poor angle. Usually these incidents were - and nearly always still are - ignored and not broadcast in highlights reels if they happened against us, or else debated endlessly and attention drawn to them for days/weeks if in our favour.
The truly shocking aspect to me is the fact that the LRA, SFA, SPFL, MIBs, VAR & media know that fans can review incidents almost immediately and highlight their errors/cheating and yet they still continue to do it week in, week out, knowing full well that there will be zero impact on their refereeing career - in fact, they are usually rewarded for these "honest mistakes". Are they biased, cheating or simply awful - either way, they are not fit to referee our national sport.