Anyone who knows how to analyse race videos properly & also reads the stewards reports, knows that for the most part the stewards do a very good job of querying anything that is at all questionable & are very quick to take action where possible & needed.

Are some horses given a run? Yes
Does it happen often? No
Are there races where all the jockey's are in on it & only one horse can win the race? Not an easy thing to do & I haven't seen it on a metro track since the early 80's.

For the most part the stewards do a very good job & metro/provincial racing is 99% of the time reliable. You will see some pretty dodgy stuff at some of the country tracks but not regularly & it's only gotten away with because the stewards aren't as well educated.

In my experience anyone who continually makes wild & unfounded accusations of impropriety simply can't accept that they have made an error in judgment & are looking to blame something other than themselves for losing their money.