You can get passive earning by investing in shares. Or maybe real estate somwhere at good location where is big demand so the value is rising. Or from valuable watches, jewlery, art, gold. Bitcoin could be also source of passive income if you have invested it somwhere or maybe just by holding it and waiting for price to go up.
No not agree with you these source can not be source of passive income, these source can be investment source but can's be passive income source. Getting a real job or a business income e.g. regular income from a shop can be passive income.