I incline towards letting surveys, particularly academic surveys, through rather than deleting them as spam because:
- They aren't trying to sell;
- We might have a worthwhile contribution to make to a worthwhile project;
- Students surveying on cycling matters are likely to have a genuine interest in cycling;
- That seems to be the precedent from previous mods (although of course I don't know if deleting surveys had been done in the past, as I wouldn't have seen them).
Is this a reasonable take?
Of course, if a survey turns out to be a poorly disguised marketing push, or if the links bring up virus warnings, let me know and I will blitz it.
(The only recent one I have noticed was University of Utrecht, IIRC, which I would have assumed was safe)