The daycare he is going to has about 30 dogs max BUT they are placed in smaller groups of no more than 4, matched for play styles etc. They also have down time - the owner was very keen to point out that they don't just let them run riot all day. They send photos and report back. They also insist that when dropping off dogs stay in cars until the kennel workers come and get them to make sure they control interactions as they know the temperaments of the dogs.
That all sounds like bollocks - no offence OP.
30 dogs, but they have them in groups of four? So they have 7 people (at least) working there all day - because they should be supervising every group all the time (which they almost certainly aren't).
That argument then makes the below seem like even bigger bollocks;
'Control interactions,' - how? By having all four dogs on leads when they first meet? So they then have 4 people holding leads of all four dogs (because you can't just have one on the lead and three running loose - that's dangerous and a recipe for problems). But okay, if they're doing that properly...who is supervising the other dogs to ensure nothing happens? And you cannot 'control interactions,' - having a dog on a lead does not automatically give you control. My cocker spaniel can nearly tug me off my feet when she wants and she's tiny. If a dog wants to attack another dog it will, and a lead won't stop it.
Even IF they have 7 people at some point, these people are leaving dogs that do not know each other unattended. It's a recipe for disaster. They're a day care. They don't know the temperaments of the dogs - and people lie. 'Oh my dog loves playing,' - usually bollocks and right up there with 'he's very friendly.' They cannot be sure they are matching dogs properly. It's a complete guess.
There is no way they are doing the above you think they are. Literally no way. Not unless they're not turning a profit. Sorry, OP, but I think you're being taken for an absolute ride here.