1. That they will continue to raise prices like many other in the SaaS-space, without grandfathering excisting user/customers.
2. That they will keep limiting certain integrations to their premium plans. This prevents me from integrating with them for new "pet"-projects. I make a lot of MVP-type product for clients, that we test the demand for. For such products, I usually integrate with a lot of tools straight away (GA, Mixpanel, Facebook Ads, Adwords, Optimizely). Even though such MVP-project only will get a few hundre visitors, it still requires Segment.io's "Startup"-plan, which is 79usd/month. I think it makes a lot more sense to allow most integrations for the free plan, and rather segment your customer based on API calls. Many of the integrations that require the Startup-plans are really useful for MVP project (Facebook Ads, Adwords, Kissmetrics, Mailchimp etc.). So please segment your customers based on API-calls, not integrations (maybe except for super expensive enterprise software). I know I could just have one "Startup"-account, and add all the MVP projects to that account, but some of my clients want to have their own segment.io account.