Ok for TRON and ETH (although probably not up to date as it's sourced).

But for others (BTC, BCash, LTC), the limit you set is way too high. My limit for Hive was 1 HIVE, so you should convert that to USD, and use that as the limit. It's 1500 satoshis for Bitcoin. And of course this goes in the favor of Hive/Steem again, making it look even better distributed.

BUT ... BTC, LTC, BCash or ETH are not DPOS chains, therefore stake is a bit irrelevant in these systems. What is interesting to chart would be the hashing power, because it's what controls the chain! Also important to note that Steem/Hive is a blockchain focused on improving distribution, through proof-of-brain, despite what all the powerful people on this chain say about it, it's working fair. The main issue on steem is that not 100% of the inflation goes to rewards, 10% goes to witnesses, and 15% to SPS I believe. This reduces the efficiency of the system.

Let's not talk about EOS, we all knew it was a scam. Let's just hope Dan Larimer comes back to reason and build decentralized social media again (VOICE ???)

If you want to properly analyze all the coins distributions, looking it as "Top X% controls Y%" is a bit weak. Instead, we should try to find the closest zipf law parameter. The lower this parameter is, the better the overall distribution. It honestly would deserve a small website, or maybe coin market cap could do it.