1. Why this portal shows only earned points from PC calculations in profile?
I also have android.
Or label is incorrect?

2. Is is possible somewhere to check stats in next way?
View:
- user with more points amount;
- me;
- user with smaller points amount.

3. Does Boinc, Rosetta or GpuGrid has REST paginable API to obtain all users with points?

Not sure how far in to this you wish to get.

There are many statistics sites that can show your personal position in the ranks for BOINC projects. Such as BOINCstats:
https://boincstats.com/en/stats/14/user/list/

Each project has a statistics file available to download, this is the source information for the third-party statistics sites. But you could download and use the information as well. Here is some of the BOINC documentation:
https://boinc.berkeley.edu/trac/wiki/CreditStats

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Rosetta Moderator: Mod.Sense