Problem with scraping proxies

I use scrapebox to get some working google proxies, i got a 10k list, and only about 300 were with google pass, i kept those and everytime i test them again, the number goes down and they are shown as dead, but they worked like 15 sec ago, the list from 300 goes down to 3-4 proxies.
10000~(list)
300~(fist check)
90~(another check)
60~(another check)
40~(another check)
30~(another check)
20~(another check)
10~(another check)
5-6~(another check)

its always mess to scrape yourself.

there are proxy share pages where you get doe working. best is to buy privat ones.

I can never get and decent proxies from Scrapebox. As above, it's best to get some good private proxies.

Most people like you are harvesting the same proxies, so these proxies are get banned quickly because others already used that to scrape.