In reality, United's, ahem, 'local businessmen' were big, far-reaching companies and among the richest in the game, and United were the biggest spenders in the league by far before the advent of the PL. This money was hardly 'earned' by being one of the most successful clubs of the era. Far from 'getting lucky' with the advent of something that was purely coincidental, United were instrumental in engineering the carve up of the English top flight that the PL represented. With the PL, the best positioned clubs sought to ensure that the lion's share of the money went to them, and this is exactly what happened, and which is why the top four, where the bulk of the money is concentrated, became more or less self-perpetuating and unchallengeable before new investment in, first, Chelsea, and then City came along and made the PL more competitive. Other big clubs who happend to be less well-postioned at the time were reduced to the status of fodder, doomed by financial necessity to having their best players hand-picked by United and the rest of the top four.
City are not 'owned by Abu Dhabi,' and, in any case, Abu Dhabi's human rights record bears no worse a comparison with many others, including the US and UK. Furthermore, United had long-term sponsorship deals with the Saudis, whose human rights record is indeed among the most horrific in the world, and have no qualms about having sponsors from among state entities in other parts of the world with dubious human rights records, such as Aeroflot. Among their current financial sponsors are Emirates NBD of Dubai and CB Bank of Myanmar. They would have happily sold out to Qatar if the latter hadn't balked at the asking price. INEOS, meanwhile has its fingers in the oil industry, and Ratcliffe has a happy relationship with the leaders of the Gulf states.
You can claim City have 'cooked the books', and broke the rules, but lets see if the IC agrees when the case is heard. And if any rules have been broken they were rules which United didn't have to adhere to when they were dominant because they didn't exist: they were intoduced under pressure from United and others who'd had their noses put out of joint because their cosy little cartel had been broken up.
Why am I not surprised that you happen to 'know' 'plenty of City fans who hate what the club has become'?