Wazzup Pilipinas!
Because the general rule is ANY income is subject to tax, even income from eBay sales must be reported and is taxed.
No distinction. Basta if you earn something, that's income and that's subject to tax.
I'm a blogger too. Does that mean as long as I have a website, I'm officially a taxpayer?
Only if you earn income from your website or if you get any payments from blogging.
Different types of ITR forms are filed with the BIR depending on type of income.