I have tested several proxy providers since 1 year
Today, I run 250 quality Instagram accounts (aged from 4 months to 4 years) with low settings > less than 350 followings/day - no spam, no comments, no DM - max : 2 accounts per proxy
ProxyMillion : bad experience
Good experience during 8 months. It has became a nightmare after : 15% of my accounts using their proxies were banned. The last time I used them, 80% of proxies died after 3 weeks of use.
MyPrivateProxy : good experience
5% of my accounts were banned during a ban wave but it seems that the responsible is SMSPVA.
Since this accident, I bought SIM cards
Proxy-n-Vpn : good experience
10% of my accounts were phone verified in 2 months but no bans
MassProxy : good experience
Few problem at the moment. Only 5% were phone verified in the last month, but I don't feel very secure
What I want to test in the future : Instantproxies, Highproxies, BlazingSEOllc and SSL Private Proxy.