Is chess.com rating lower than other chessrooms?

At chess.com you start with 1200 and earn 8 points for a win, whereas at e.g. lichess.com you start with 1500 and earn 7 points for a win, after the ~100 first games. So I at chess.com need too many games just to reach 1500 (now I am below 1100) and I find it pointless to try this in comparison to play at lichess.com and try to raise my now 1532. Am I wrong somehow? A grandmaster is considered whoever has 2200 no matter whether he got his 2200 rating at chess.com or lichess.com?

Online ratings have nothing to do with becoming a grandmaster, so let's get that out of the way first.   And, even if they did, 2200 is a long way from grandmaster.   Every site has it's own unique rating pool that largely determines how difficult it is to gain rating.  Generally it is considered easier to gain rating at lichess apparently because their rating pool is somewhat weaker.  BUT, the only purpose of online ratings is to make it easier to pair you with someone of your approximate strength so you can have a good game.  If you want to be recognized as a titled player, you have to do it the old fashioned way by going to tournaments.  Good luck!

Chess.com let's you choose your initial skill level and the rating starts from 400 to 2000: https://support.chess.com/article/671-how-do-i-create-an-account

The site also uses the Glicko rating system, so the amount of points you win or lose in the beginning, are a lot higher, due to the system's rating deviation (RD) value. Once you have a sufficient number of recent games in a particular pool, that rating change will be lower.

However, the way that system works is that it is designed to quickly get your rating close your strength within the rating pool on site. If you made it to 1100 after hundreds of games, that's close to your strength and unless you improve your chess ability, you're not going to get a lot higher. Your chess ability will drive your rating more than anything.

Other sites have different playing pools, different starting ratings, and therefore likely different ratings. Ratings are not absolute measures of playing strength but based on previous performance within a playing pool, and generally speaking, can't be compared across pools.

Titled players are titled based on OTB games, and have nothing to do with online play.

So you are saying that players who are recognized, played online just for the fun of it or for practice and if you get >2200 you will earn nothing. First, how do you know this. Second, how can you enter tournaments and OTB games that can give you money (or first recognition and then money).

That's unlikely to ever happen. Also, I've seen a number of recent OTB events that have been having good turnouts. Maybe not as good as in the past, but not terribly worse, unless it was my last event

To get GM  title you have to play over the board chess (events that are organized by FIDE) and earn 2 500 FIDE rating + 3 GM norms on tournaments. 2 200 FIDE is CM title - candidate master which is the lowest title there is, but it is still hard to get. 

Online chess will generally not grant you titles (there are some arena FIDE titles, but those are not taken very seriously, and I don't know much about those). Online chess is played for fun and as a training.

lichess is not a commercial site. its not lichess.com