Informal surveys are done literally all the time, by university undergrads, sensationalist news organizations, political organizations, businesses, etc.
If you want to publish somewhere, you'll need to follow their rules. If you're using or establishing some sort of business or medical relationship with those surveyed, there are restrictions on how you can do that. Targeting or collecting data on under-18 humans in many jurisdictions is restricted, and I don't know what it takes. If you're calling or texting people, there are rules there too. The rules seem to be ignored a lot of the time, especially for informal one-time small-scale uses.
The bigger problem I see is validity of study, and representative-ness of sample. The sample topics you give all seem to be about counting or quantifying something within a population. Most of your work will be in defining the population you're trying to measure and figuring out how to get a wide-ranging evenly-distributed sample of responses within that population.
The other "most" of your work will be in figuring out how to get the data that actually tells you anything. There's a lot of individual variance in the topics given, and a lot of ambiguity in what results of any concrete test would show.