Places to park a Domain where it can make money

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Parkingcrew looks great. Okay, can you explain what are blocked domains? I know domains blocking in country or region but what is it in search engines?

Primarily they are same as blocked in a region or country. But in this case they are by search engines. When a domain fails to meet the TOS of any search engines this type of blockings happens. For example any domain, hosting or serving malicious content will be blocked because they clash with the search engine policies.