Do you really get that much spam? I've had the same email address since 1990, I use it pretty much everywhere, and I get maybe 10 spam emails a day, with no filters.
I find that extremely hard to believe. Do you have some very anomalous usage patterns, such as never using that address to register on websites, and never having it posted anywhere spider-crawlable on the Internet?
I'd wager that an address that is bot-scrapable would soon see dozens of spam messages a day, if not much more.
(been using DDG for search for about 6 months now, rarely if ever get better results on google)