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I did emailed them, and that their reply was, well standard bla bla, and that i should concider PFI.
..are they slowly dropping free sites and push PFI or just coincidence?
Not in my experience. Teoma is crawling much more aggresively and including a lot more content for free.
Disappearing on one engine while ranking on others is a common experience. You could replace Teoma by Yahoo, MSN or even Google and lots of people would say the same thing.
They rank well on all other engines but don't rank anywhere on search engine x.
Teoma has a significantly better algo than other engines (IMO) for finding on topic sites but it is also quite different. What works on others may not work on Teoma (and vice-versa).
Neither one of those moves did me much good. I am a firm believer that once you pay to play in today's market ... your site is marked. Stop paying and you'll feel the wrath.