This is taken from our FAQ about Web 2.0's:
If you are trying to index Web 2.0's created with software like Money Robot, GSA or something similar, indexing rates will most likely be very low. This is because these sites are highly spammed. Hundreds of thousands of spammy pages are being created on the same small amount of domains.
Google uses crawl budget to determine how often to crawl domains and Google will only crawl the same domains so many times per day. We also noticed in March of 2018 that google seemed to intentionally lower the crawl budget for these type of domains due to them being known as highly spammed domains.
To give you an example. Today alone we've had hundreds of thousands of the same (approximately 50) Web 2.0 sites submitted to the indexer. An example of these type of Web 2.0's is:
ampblogs.com
blog2learn.com
ampedpages.com
articlesblogger.com
imblogs.net
These type of blogs are basically a waste. They are so spammed to death and Google is barely crawling them anymore. This is just a sample of the type of sites we're talking about.