Donors do not take part in research. Neither donors, nor universities, decide who can see data. To the contrary, universities and governments often require that raw data be made available for government funded research (again, donors are not funding research activities, they are funding football teams). As was mentioned earlier in this thread in response to (IIRC) one of your comments, it is typical that raw data is made available to the community by researchers as part of the peer review process even when governments do not require it. For example, in the previously mentioned post, I linked to the procedure for obtaining the researcher's raw data. You can do this and perform your own analysis if you find the published results inadequate.
In the aforementioned example, the main concern was that the pharmaceutical company providing hydroxychloroquine would have undue bias in favor of positive results for their products. Researchers are required to state any possible conflicts of interest for this reason, and the researchers detailed the steps they took to make sure that they were not biased by needing to work with a drug manufacturer in order to obtain the drug in question. Among those steps was that they conducted a randomized trial. RCTs are considered the "gold standard" in medical research.
Scientific research papers also undergo peer review by 2-3 independent researchers at different institutions, often in different countries, who are also experts on the same research topic. This means that not only would one research group have to be corrupt, but every research group directly involved in the process would be as well.
Beyond that, what matters is not the result of any one paper (though papers are always more credible than random internet sources), but the consensus of researchers. On important topics, there will be dozens of papers produced by hundreds of researchers. Once again, there's a basic misunderstanding of the scale of who is involved in research. There simply are too many people involved for your claims to be plausible.