I've kept out of this thread for the main.
I've dubious about Young but then I have a healthy dose of scepticism for anyone making claims about something that they also have a commercial interest in.
I notice you say cancers thrive in an acidic environment a quick google brings up a lot alkaline and natural health websites that say the same thing, but I can't find anything related to actual scientific studies.
As for whether or not Young is being blocked by pharmaceuticals and other scientists not accepting his research. One of the main points is that protocols should be meticulous, under controlled conditions and replicable. If a study is performed in a way that these 3 criteria are not followed then research will not be accepted by the wider scientific community.
pH. Unfortunately the idea of acid vs alkaline is not quite so simple as it initially appears. There are various factors that influence pH and it's not a case of adding something more alkaline to shift the balance. The whole alkalinity system is not
linear. I admit human biology is not my area of expertise, but here's what happens in the oceans to show how everything interlinks.

I agree the idea behind the alkaline lifestyle is basically a premise of healthy eating which a lot of people fail to do but I caution against extreme adherence to one thing, but respect that is your belief.