Cutting into the peyos unfortunately is a big problem with Chasidim. There are alot whole don’t have a kosher shiur. In Williamburgs most mikvahs have a guy who cuts hair for 7$. Most of them just want the 7$ and don’t care about the shiur. In Pupa on Bedford the guy is very careful and knows the haluchos. I used to get my hair cut there until I moved to Boro Park and now just do it on my own because I don’t trust anyone except for him. I have a bigger shiur then most Chasidim and it looks “extreme” to most of them but it is not worth being oiver on a deoraisa.
Toi, a tuna beigel is no example, they are barely frum usually.