This service is provided free of charge to you. If you find it useful, please consider donating a few dollars to keep it alive. Even small amount like $1 could help too. Your donation will help keeping up with the expensive costs.
PS: Running this service costs me approximately ~$1.2K a year (domain name, private servers, cloud storage premium accounts...). That amount of money is not small in "3rd-world" countries like mine :(