I wonder if it's not scary for people to send a large amount of BTC, let's say 2000 to such services?
There is nothing to stop a person from making multiple deposits instead to send 2000
BTC at once. Especially since some mixers don't have 2000 BTC in stock (the maximum to mix with Blender.io is 2800
BTC currently). As a safety precaution, it's also better to do it
When you have over $90 million worth of bitcoins, I don't think it's a problem to spend i.e. $1000 on transaction fees and the service fees.