I have trawled through all 23 pages and am going to put in my 2 cents after reading some of the replies.
And I'm going to try it. It's only a $50 investment for a second hand router, if it doesn't work out I can just sell it again for the same price.
I'm the the UK too.
So, I used to run a paid for WiFi hotspot business on a small scale (didn't manage to grow it due to difficulty finding cost effective places to install enough routers and lack of funds.)
I used to charge for access but would offer 1 hour a day free to users to entice them, they had to create an account, so yes, people will go through the effort of entering details to get free WiFi. I never combined it with CPA offers because I wasn't aware of them at the time.
It is true no one is going to spend 15 minutes filling out a survey, but they will do an email submit, they usually pay around $1.50 and with auto complete the user doesn't even have to type their email address. Just disable all the offers which have a long, drawn out process to get a conversion. I think App installs is one of the best options, no chance of entering fake details, true there will still be the IP address issue but each device has a unique MAC address so the CPA network will know that you are not buying the cheapest smartphone for $20 to make $0.30 off an App install.
I spoke to two AMs out of five that someone else mentioned here saying none of them would accept the traffic, one said yes and one said no. I explained that I would actually offer Internet access. I don't understand how people keep saying this won't work with incentive offers, this is exactly what incentive offers are for. There are thousands of people using shitty fake COC/Paypal hack generators to promote CPA offers, give nothing in return and the major networks don't seem to care, the quality of the leads must be very poor too.
As for placement of the equipment I'm a bit sceptical about having it in a car in an airport carpark and the signal reaching inside the airport from my knowledge of WiFi signal range and London airports.
But there are loads of other options for equipment placement.
Most router only use 12 volts so just cut the plug off and hook it up to a leisure battery, one like
this would be able to power the router for about 4 days. Put it in your car and park it somewhere like a busy park or outdoor area where people gather like the beach.
Or get a small battery like
this for a portable version which could be put in a bag or the helmet storage on a little motor bike, park it up for free and come back later. If the returns are good and you don't mind possibly losing $80 worth of equipment you could even put it in a trash bag and leave it on top or near a dumpster which never gets emptied.
Ask a friend who lives near an area with likely takers of your free wifi if you can put the equipment in their house and split the profit.
Put the equipment in a bird house and stick them in trees in local parks!
Pay a homeless person who is selling the Big Issue in the street to have the bag with them while they work.
I think targeting visitors is the best idea because they get charged a lots for roaming data, they all want free WiFi, in my town I could point out today at least 10 groups of foreign language school kids with 20-30 people in each group, all with smartphones sitting in parks, on the beach and in certain areas in the town center.