Trash content alway existed. Always.
AltaVista was all spam results when Google came on the scene. From where I sit, Google just doesn't care to work on search any more.
For example:
- pre 2005?, Google search terms were never aliased.
A search for Bob, never returned Robert or Bobby. To make things "easier", alias searching was added. Now, there is all sorts of algorithmic aliasing happening, and it poisons the results further.
- Couple this with the desire for verbal google searching to work, without complex queries, and even more aliasing/approximation of search results happen.
I've seen homonyms aliased as of... 2016? Why? Google voice searching.
- Quotes are only suggestions, only verbatim search forces precise terms (+ used to mean a word must appear as written, but was removed because it was interfereing with Google plus username searches..)
- These days, Google spends more time trying to take content from web pages, and insert the answers at to of page. They want to be wikipedia, with you never leaving their page.
All of the above, and more, show a steady decline in the desire for precise results, and instead, a desire to sacrifice search quality for profit, and pet projects.
As others in this thread have said, Google isn't Google any more.