Lego bought brick link to keep it alive after the founders family tired of running it after he died.
that makes a nice story but was not at all Legos core motivation
taking control over the main secondary market is a grate way to
- gain positive sentiment through things like the creator program
- bolster you product prices by making sure the prices of 2nd hand sells stay high (which is both good and bed for the consumer, it's good as part of it is about consumer protection and reseller quality, but it's bad because there is a lot of insensitive to drive prices up beyond that)
- systematically exclude all brick competition from the most dominant 2nd hand market, a typical consumer hostile marked power abuse move which by the removal of competition allows artificial higher part resell prices which then can be used to reason for higher prices of new products and also allows better enforcement of other abuse strategies, like how they systematically abuse trade mark law wrt. mini figures
- by subtle support for one particular 2nd hand store and supple opposition(1) to others they can further enhance their monopoly position. (1: Or for anything reselling non Lego brick often not at all subtle legal harassment)
- some degree of influence on information flowing through the market place, they can't abuse it that much but it's still a factor
so they have a lot of money reasons which sadly most likely won't be good for the consumer to buy it, any story about "saving it" (weather real or not) is a bonus on top which by itself is unlikely to have made them buy it.
there is some (small) money into taking Lego sets apart and selling the parts (1), but only if the sorting and for used sets taking apart, cleaning, damage/quality assessment are cheap enough. So countries with lower wages(2) are better suited. At the same parts people from less-wage countries have more motivation for "clever"/unusual business ventures weather legal or not.
(1): Naturally not for all sets, but every session there are some badly selling sets you might be able to buy both with large Rabatt and in bulk and have enough "good" parts to be worth it. "mini figure only" collectors and sometimes being able to buy for retail prices can help, too.
(2): While especially Poland has been catching up Europe in general still has the lowest wages in Europe: https://en.wikipedia.org/wiki/List_of_European_countries_by_...
You can legally produce lego compatible bricks and many reputable companies like Cobi do so. There is nothing grey about it. Some of these companies offer better quality than Lego these days. Lego isn't the only game in town anymore.
The economy for sellers lies more in picking up unopened new sets for bargain prices from local shops, both on and off-line, and reselling the individual bricks. New Lego sets just are cheaper in Eastern Europe. Part of this economy is that some bricks are much more sought after, which is reflected in the piece prices. This also means that more common pieces will be sold cheaper. It seems to balance out.
Personally, I rarely need to look beyond the Netherlands for bricks I buy for MOCs on Bricklink. Sometimes Germany or Belgium. The prices just are competitive.
neuroelectron•1h ago