So I use Instagram very rarely to keep in touch with friends and family and just recently (2 weeks ago) made a Facebook account for groups related to my job (teacher) that I can’t find anywhere else. Today, both accounts were suspended because they violated Meta TOS against bots. Is my use of ProtonVPN to blame here?
I know that Meta is a big no-no in the privacy world but it’s something that’s tough to leave both personally and professionally.
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If you create a new account using a VPN(be it Proton or any other), you get flagged.
Nah, I use VPN every time using Meta apps, and no problem using them.
All major social networking has protection against second party bots and spam. Games like cod and pubg also has the similar methods which has a rule set to auto flag certain domains and put them in a watch period. During that watch period, if you post more normally then an average person, you get banned. If you add alot of people in a very very short time or even be reported accidentally during the time period, your insta banned. X, Meta, Reddit, and many many more are to blame. I personally blame the bot makers, spammers, scammers and hackers for using a great service for exploit.
If you are based in the EU and GDPR is applicable to you, you could file a case.
Meta is obligated to respond to your query and show you information they have on you. Including their assumptions they’ve assembled based on your connectivity. If not, a lawsuit suite will.
Recently I opened a new fb account using meta’s own fb onion site. I haven’t had fb in more than ten years. I used a fake name and an iCloud Hide-My-Email address. It suspended me instantly and stated the reason was using a fake name. I know meta’s lying. There’s no way it has any idea that the name I’m using is fake when I use the Tor browser and Hide-My-Email on an onion site. It says I could appeal, and of course I won’t. I’m sure the liars at meta think because I really want an account I’ll send them a pic of a government ID. 
likely you got banned for adding too many friends being “overly” active while on a VPN , new accounts get sanctioned harder specially on VPN to fight scammers / bots.
Exactly what happened to me and lost my Facebook account that was created in 2007. No warning, no nothing. Direct suspension. I was using Proton VPN.