We actually do check every single new registration - and yes we do get about 350 attempts per day but it doesn't take long to check them once you gain some experience and can identify the "wrong" IP ranges.
We also have a range of IP blocks that are stopped from even attempting to register along with a long list of unacceptable email domains as well and this knocks out about 300 a day as well.
Finally, we use an automated purge every 5 days for those who don't activate in that time frame - these are usually because the email addresses are fake.
Cheers
Russ
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