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Please lichess, please tell me where is the source of your master opening explorer database

It contains normal games, sure, but it contains a lot of games like these:


Literally, 12 blunders on one side and 10 on the other and those people are rated 2200+?? Please lichess, please tell me what is going on...
Uh, Shamkovich hardly qualifies as one of "those 2200+ people." The guy was a top Soviet GM.
This is the single biggest problem I have with lichess. I think the analysis tools that lichess provides are fantastic in many ways, and lichess does an enormous service to the whole chess community by freely providing these tools, without freemium limitations. And the study feature fits into that as well. But the games in the masters database lack any kind of relevant context, and are therefore almost useless.

What was the time control? What was the event? Where have these games come from? What do the ratings mean: are they classical FIDE, or national ratings, or something else, or all-of-the-above? If the latter, then I'm sure the developer knows how useless that is without other information! And, most importantly, how can I actually search the database in a meaningful way (seeing, at the very least, more than 3 games in a given line)?

Now for all I know there might be very good reasons, perhaps even legal reasons, why they can't reveal all this stuff or give everyone full access. But it would be nice if someone could tell us at least one of those reasons.
I study master games only from 2600+ players . There is massive difference between mediocre masters vs top rated.

Even on top category, you have 10,000+ games to study.
There is rating attacked when you look at database/ opening book in lichess. You can close the games if they have low rating.

Many DVD have collection of famous master games too ( e.g Fritz, chessmater), I learned from those. Worth buying a DVD if you can buy.
#4 the PGN shows the event, it is "US op". Doesnt show the time control though.
Time control of the US open at that time was presumably 40 moves in 2.5 hours, adjournment, 16 moves/hour

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