SEO has essentially destroyed search engines, what are some very useful websites that you might not get given by Google?
A lot of services have stopped accepting + addresses as valid, or even stripping them before saving. So at least for a while, - addresses could be more useful
For nerds like us there’s a cool article at https://people.cs.rutgers.edu/~watrous/plus-signs-in-email-addresses.html that covers this in detail.