Anyone ever fly the Spanish low-cost airline, Volotea, with carry-on bags?

I'm flying flight V7-4111 from Istanbul to Mykonos in September. I noticed some reviews/youtube videos that stated they can be very strict (in some cases unethical) about charging for carry-ons at the airport.

My carry-on fits their advertised size, and I've never had problems with my carry-on. I just worry if it is say bulging out by a half inch if they are going to pound me with a 60 euro fee.

Thanks!