Just a few things
1- You dont need a huge downpayment to buy a home....In my state, the local credit union does first time home buyer deals. zero down, no closing costs etc...If your income to debt ratio is good enough to cover the mortgage, then you qualify for their first time home buyer program...most, if not all states credit unions have these.
2- The cameras are clearly for internet streaming of some kind...legal or otherwise. It very well could have been a legit streaming service like a voyerdorm or welivetogether type of site.
I am digging into my reverse dns lookups cross referencing the address and emails address etc...odds are there is some other website registered to him
3- A dark web search is needed. IF there was illegal recording and selling going on, its gonna be dark web based. Dark web marketplace search for his usernames would be the first place to start...Its a slow process tho as the marketplaces change daily.
4- Airbnb....so there is an underground network of airbnb hosts. 90% of the time they are legit airbnbs......but they also have a presence on the dark web, and the other 10% of the time they are used for illegal activities such as prostitution, illegal steaming, temp cam girl setups (for people who travel and need a new cam room setup ASAP)
Not saying AT ALL this is the case, but it exists and is out there....