People were paid to participate in the vaccine trials.

• Article: Are we paying COVID-19 vaccine trial participants enough?
• Article: Carl Elliott Answers Five Questions About COVID-19 and the Ethics of Medical Research
• Article: VERIFY: Yes, text message offering to get paid to participate in COVID-19 vaccine trial is real
• Article: Can you really earn $1,200 to test a COVID-19 vaccine?

Imagine who would go for this kind of bribery: the most vulnerable, who likely cannot afford care if they are dealing with any adverse reactions.