When you use open enrollment on your LifterLMS website, you open yourself up to the potential that bots can create a lot of spam accounts on your site. LifterLMS open registration allows people to sign up as users on your site without purchasing any products. If you use open registration without requiring a voucher code, you may be vulnerable to a bunch of spam accounts being created on your site.
Here are some links to resources I discussed in this post:
If you do purchase any products from LifterLMS, here is a coupon you can use for a discount on your order: https://getlifter.com/coupon