well you can do the math yourself:
Intel Core i7-9700K - 375 euro
Alpenfohn Ben Nevis - 24 euro
cheapest possible Z390 mobo - 115 euro
RTX 2070 super - 525 euro
16GB DDR4-3000 - 60 euro
cheapest possible 480GB SSD - 40 euro
1TB HDD - 40 euro
DVD drive - 10 euro
cheapest possible 600W PSU - 30 euro
Windows 10 - about 100 euro wasted
Wifi adapter - 10 euro
total 1320 euro. so their profit is at least 180 euro on this system. probably a lot more because they can buy cheaper lower quality components in bulk that they get from china instead of paying consumer prices. the mobo, ram, ssd, and psu in this system probably belong on a scrap heap.
3000Mhz ram with really high clock latencies,CL18 or more, really slow random 4k read/write speeds on ssd, mobo missing a lot of features, psu with shit power efficiency that will probably blow up.
you can probably build a better system for less. first off you dont need to buy windows again because you probably already own several licenses. so thats 100 euro in the pocket.
now you spend a little bit more on a good ssd, intel, crucial, have really good cheap models, if you want to pay a bit more get a samsung evo 970.
also spend a bit more on a good psu with 80+ gold or platinum, 600W is a bit on the low end for such a big gpu, which will draw 215W on its own, running at stock clock speeds. it will use more while turbo boosted. maximum power draw is 300W, with 1 6pin and 1 8pin pcie power connector. considering you only want to use at most 80% of a PSUs rated power spec to get good energy efficiency and long lifetime, that only leaves 180W for the entire rest of the system. which isnt enough. get a 700-750W PSU. gold or platinum 80+ rating
for harddrive, its better to buy a 3 or 4TB drive these days, 1TB drives are expensive per GB.
now ram, if youre looking to spend 1500 in total, of which 375 on CPU and 525 on GPU, you should probably shell out for decent ram kit. the cheapest i would recommend for this budget is 3600Mhz CL16 kit that i already linked:
but you have room in this budget to spend 150-200 on a kit with even lower latency, for example:
especially in old games like csgo, built in mediocre engines, ram latency is an important statistic.
you can also buy a normal cpu cooler, like a scythe mugen, or even a cheap closed loop water cooler, instead of this thing in your build that i cant even find in any stores.
and then for mobo, you can pick one that has a good layout and good overclocking capability for about 150 euro instead of paying this company too much money for a random chinese mobo that probably doesnt overclock for shit.