Check the most active posters. Currently, the top 5-24 is completely filled with only Stake signatures:
5. 126 Hero Member EarnOnVictor (BPIP)
6. 118 Hero Member QueenVera (BPIP)
7. 117 Hero Member Blitzboy (BPIP)
8. 117 Hero Member junder (BPIP)
9. 113 Hero Member Oluwa-btc (BPIP)
10. 109 Hero Member rendravolt (BPIP)
11. 107 Hero Member klidex (BPIP)
12. 104 Hero Member Hirose UK (BPIP)
13. 100 Hero Member maydna (BPIP)
14. 98 Hero Member ethereumhunter (BPIP)
15. 98 Hero Member Docnaster (BPIP)
16. 95 Legendary slapper (BPIP)
17. 92 Hero Member Weawant (BPIP)
18. 91 Legendary piebeyb (BPIP)
19. 90 Hero Member Jody.Drummer (BPIP)
20. 88 Legendary hahay (BPIP)
21. 88 Legendary Hispo (BPIP)
22. 87 Legendary LUCKMCFLY (BPIP)
23. 85 Legendary Dewi Aries (BPIP)
24. 85 Hero Member Fivestar4everMVP (BPIP)
Stake doesn't care who they hire, as long as they post a lot (of BS). The spam was called out 5 years ago, and it's still going.