The obligation is the search. A business needing waste removed legally types collection and disposal, not recycling philosophy, and the pages that match that language get the enquiry.
The streams are separate. Used cooking oil from kitchens and waste engine oil from garages are different materials with different rules, and one page serving both convinces neither buyer.
Documentation questions arrive early. Somebody asking what a transfer note must contain is usually about to be inspected or has just been told off, and answering it produces a contract rather than a click.
Volume drives the contract. A single fryer and a hotel kitchen need different frequencies and containers, and stating what suits which size lets a manager self-select before contacting anybody.