They used to be very low cost, with many rough edges.
I think the rough edges got fewer, they started offering a lot more managed/PaaS services, and de facto raised prices (mostly by cutting a lot of the low-cost offerings and/or making them a lot less attractive, plus some actual price increases).
I am still using them for hobby projects and didn't have issues with my running instances, but did occasionally run into issues when stopping/starting them (e.g. resource exhaustion, long delays, etc.).
They really like obfuscating the actual price by showing everything in hours instead of months, so you're paying "zero point zero something" with no easy way to see what the actual cost per month is. It's possible to find the information but they really push the hourly price.
They aren’t even close to Digital Ocean in terms of quality of service, support, performances or documentation. They are more like OVH, another french provider.
A lot of software limitations of their products aren’t documented, an example: don’t expect to put more than 40k files in one single object storage bucket. It’s written nowhere and when you’ll start encountering strange errors with your apps you’ll have to deal with the support team. First you need to pass the triage level where people have no clue about whatever is technical, then after a few days you will go higher in the chain and finally be redirected at someone in charge of the production who will announce you that kind of limitation.
Disclaimer: I’ve been a customer since the very start of Scaleway (attracted by the low prices), then got dissatisfied a lot and asked my account being deleted last week.
Thanks!