They are paid by governmental departments, blue chip companies etc to gather public opinion of a variety of topics, which helps policy decisions for government or companies to make, when deciding on new products or services, or how the electorate as a majority from a selected poll will vote on a policy issues.
They hold an amount of personal information, but no more than you might give to a online questionairre from one of your banking or service providers. This is all backed up by Data Protection.
The only downside is that it can take along time to get enough credits for the £50.00 payment.
When you next hear on the news that they asked a poll of the population across Britain for their views, it will probally have come from yougov or a similar organisation.
Nothing sinister about this particular outfit.
Debt Collection Agents are like nappies, They should be changed regularly and for the same reason....