Mojeek is a web search engine based in the United Kingdom. The search results provided by Mojeek come from its own index of web pages, created by crawling the web.
Indeed, they offer different packages for their Advanced Site Search: https://www.mojeek.com/services/sitesearch/
They seem to have a business offering custom searches and maybe faster searches for those who pay https://www.mojeek.com/services/ – since i think that’s a slippery slope i’ll give them just 4 blocks.
They seem to be trade-free. They do not seem to post ads in the search results or collect data about users for profit purposes. They do not want subscriptions or anything like that. It seems that they want to provide you with a search engine and that’s what they do.