Those LCA applications aren’t 1-1 with H1B quota numbers. Eg after 3 years when renewing a H1B the employer needs to file an LCA but that won’t count against the cap. Similar for H1B transfers and renewals past 6 years.
Overall the claim that Amazon takes 25 percent of H1Bs is extremely incorrect.
I believe there is no publicly available data that allows one to calculate the exact percent of new H-1B numbers used by a specific company.
But if I go into USCIS's H-1 data hub, I can find some information. For FY-2022 Amazon had 12.5k petitions approved. But drilling into the data we see that less than 4k of those were for _new_ petitions - the others were extensions of existing petitions. 4k out of the H-1B quota is less than 5% (there are 85k new H-1B visas per year). But even that is an overestimate because a new employee transferring to Amazon will require a new petition but won't count against the quota.
Overall, the best guess would be that Amazon use low single digits percent.
Overall the claim that Amazon takes 25 percent of H1Bs is extremely incorrect.